Body fluid stain remova/scratch repair on nubuck chair

An elderly relative had an accident, so I am not sure exactly what we are dealing with in terms of the substance. The stain dried through, and then I made it worse by scratching the leather. I am looking for some guidance in (1) removing the stain; and (2) repairing the scratches.
Attachment 2169Attachment 2170Attachment 2171

The first two pictures show the outside of the leather. I am able to remove the casing and work from the inside on the stain. The third picture shows the back/inside of the leather/stain area.

>>> I am looking for some guidance in (1) removing the stain;

The protein component is removed with help of d’Protein-10 > Acidifier-2.0 system from attracting the natural bacteria from the atmosphere from fermenting. The ammonia content is neutralized with d’Urine-2.1 from shifting the protein fiber ionic negative (-ve) that denatures the leather and manifest as tackiness to sliminess reverting the leather to rawhide.

Tools used are towels for extraction and nubuck Brush-2 and leather Eraser-4 on the nubuck side. Working on the reverse suede side is preferred to reduce surface damages and is to be work with suede Brush-3 and Eraser-5.

Solid soiling particulates wicks to the surface during drying and when crispy dry brush and erase accordingly.


>>> (2) repairing the scratches.

Nubuck scratches are repair with a 350 – 380grit sandpaper.


Use this Nubuck Leather Problem Solving Guide as reference:

Attachment 2176

Please show result after the post soil removal process with appropriate tools.

Roger Koh
Leather Care Consultant
www.LeatherDoctor.com


Attachment 2177
Leather Doctor Kit N5.uk – Nubuck Urine Killer Kit
Leather Doctor® Kit N5.uk, nubuck leather urine killer kit is designed to decontaminate urine problems. Aged urine is detectable with its characteristic ammonic odor. The presence of ammonic odor may indicate the shifting of pH value up to 10. The leather will most likely feel sticky or slimy with wet finger testing it. This stickiness is a sign of leather denaturing and reverting to rawhide. pH balance to stabilize the denaturing leather is rectify with Acidifier-2.0 prior to cleaning the protein residue with d’Protein-10. Rinse-3.0 may follow prior to treatment with d’Urine-2.1. At this stage, the leather should feel squeaky after returning to its chemistry integrity of pH 3 - 5. Stiff leather is relaxed and sticks together fiber separated by Hydrator-3.3. The penetrated stain removing process continues with hydrating prior to fat and oil replenishing with leather scented Fatliquor LS-5.5. The surface wear of the leather is greatly reduced with a rub-resistant Protector-S+ that enhances a non-stick draggy-feel to shield against sticky soiling. Note that the mentioned products suffix numbers denotes its pH value in this holistic approach for nubuck leathers urine decontamination process.


Attachment 2178
Suede Eraser-5
This is a 2½ x 2 x ¾ inch fine pumice block with corrugated side for effective nap exfoliation


Attachment 2179
Suede Soft Brass Brush-3
Suede Soft Brass Brush-3 detailing bristles brush is design ergonomically to be an extension of our hand with sturdy grooved grip, designed to produce effective result easily and efficiently. It is recommended for split suede that provides tough, aggressive cleaning with mild abrasiveness; to reduce aggressiveness slants it at an angle especially for cleaning hair on hide. Length is 7 inches with a three-row bristle 1½ inches cleaning head.

Before posting to this forum, I had already bought the d'Urine and d'Protein, and attempted to remove with just those products. As you can see, it did not really work. I've since purchased the recommended kit and am currently awaiting its arrival. I will repost once I attempt to remove the stain with all the proper products.

Attachment 2395

Please see the guide for solving urine stains, the number on the right are the steps to follow accordingly.

Tips:
Picture shows darkening effect, could possible be wick-up residue that needs to brush away with the nubuck Brush-2 and leather Eraser-4.

Suspended soiling particulates need to resurface with the help of Hydrator-3.3 and here using the paper rag for reverse transfer may be more effective to pull them all out.

Hydrator-3.3 is the last phase of the stain removing process with brushing and erasing inspection. It is this junction that decision to proceed to the next phase or repeated is decided.

Showing pictures of every step will be easier to know which steps to improve contributing collectively to the final result.

Roger Koh
Leather Care Consultant

I removed some dye/wax from the seat, so now have to repair that. Do you have suggestions as to product?Attachment 2460

>>> I removed some dye/wax from the seat, so now have to repair that. Do you have suggestions as to product?

Dyes could be reactivated by Hydrator-3.3 from the entire surface for redistribution and Fatliquor-5.0 replenishing saturate and intensify it. Leather structure rejuvenating is a safer approach then applying new dyes that may not match and anyway if new dye is applied it has to be to the entire cushion that may extend to the entire chair to a darker shade.

Nubuck that has wax is of the Wax Pull-Up types and this in infused into the leather structure after Fatluqor-5.0. Again when using Wax Effect-8.6 it will intensifier the hue or shade further and also imparts a whitish crystal residue when heat activated produce a natural sheen.

Prior to Wax Effect-8.6 application the leather types has to be positively identified. Greasy accumulated soiling may sometimes be mistaken for a wax finish. It is highly recommended that an inspection be done on the reverse cushion of hidden areas to determine if the nubuck is a Wax Pull-up type. Pictures shown will help you identify.

Nubuck is smooth aniline leathers that have its grain buff off to produce a fine nap finer than suede (flesh side). Fine naps are restored by using leather Eraser-4 and/or nubuck Brush-2 for a “finger writing effect.

Does the shine area produce a “finger writing effect”?


Roger Koh
Leather Care Consultant
www.LeatherDoctor.com

Yes, as to the "finger writing effect" on the shinier areas. You can see the comparison in areas here: Attachment 2463

My question of “Does the shine area produce a “finger writing effect”?” is connected to above mentioned -

“Prior to Wax Effect-8.6 application the leather type has to be positively identified. Greasy accumulated soiling may sometimes be mistaken for a wax finish. It is highly recommended that an inspection be done on the reverse cushion of hidden areas to determine if the nubuck is a Wax Pull-up type. Pictures shown will help you identify.”

That “Greasy accumulated soiling may sometimes be mistaken for a wax finish.”

And inspection should be done on hidden areas in comparison with the heavy used areas.


>>> Yes, as to the "finger writing effect" on the shinier areas. You can see the comparison in areas here:

Is this picture showing the spot that you are working on or hidden areas to see the original finish type?
From your picture, what cause the area to be shinier?
Is the spot you show wet or dry?

At this point I have not yet established that your nubuck is fashion wax pull-up type yet until a positive inspection as mentioned above.

There are two possibilities a) and b) below that “I removed some dye/wax from the seat, so now have to repair that. Do you have suggestions as to product?”

a. Nubuck
The wax may not be original and should be stripped back to the original (inspection from hidden original area to confirm).

b. Nubuck Wax Pull-Up
Wax Effect-86 is the recommended product for nubuck wax pull-up type (inspection from hidden original area to confirm).


Note:
Is there an identification label on the deck below the cushion or information you have during the purchase stating the finish type?


Product information:


Attachment 2464
Leather Doctor Wax Effect-8.6

Leather Doctor® Wax Effect-8.6 is design for aniline and nubuck wax pull-up leather types. This is a pH 8.6 waterbased emulsion for rejuvenating wax pull-up effect diminished through usage, ageing or cleaning.


Roger Koh
Leather Care Consultant
www.LeatherDoctor.com

Is this picture showing the spot that you are working on or hidden areas to see the original finish type?

This picture is showing the spot I am working on. The spot is the dull area.

From your picture, what cause the area to be shinier?

The rest of the area around the dull spot is showing the leather's original shine/finish. There is also some glare from a ceiling light, I apologize for that.

Is the spot you show wet or dry?

The entire area shown is dry.

Is there an identification label on the deck below the cushion or information you have during the purchase stating the finish type?

It doesn't say anything about the finish, just that it is Nubuck and that no "urethane sealant has been applied".

Suggest you post pictures that show the actual appearance.

Nubuck has no finishes except for the fashion wax pull-up type – a test is to stretch or pull if the leather lightens.

Tips:

Stain cleaning is done typically in this sequence.

1- Spot removal according to stain type.
2- Inspection when dry.
3- Entire section is thereafter clean with Clean-3.8 > Rinse-3.0 system (assuming the leather is lightly soiled).
Tools used for cleaning and reviving the nap is by Brush-2 and Eraser-4 to even out appearance.
4- Leather-rejuvenating system with Hydrator-3.3 > Fatliquor-5.0 follows to even out appearance to the entire section.
5- Wax Effect-8.6 is ONLY applied to match existing nubuck wax effect pull-up finishes types to even out the entire section with help of Brush-2 and leave to dry. When white crystals form they are heat activated to transform to a natural sheen. The nap is again brush to produce a finger writing effect.
6- Light mist spray Protector-S+ to the entire section and brush in with Brush-2.
7- When completely dry brush again for a "finger writing effect".

Here are two pictures to assist in determining the type of leather:

Attachment 2467Attachment 2468

All areas are dry in these pictures.

>>> Here are two pictures to assist in determining the type of leather:

Picture at this distance can only confirm that this leather is aniline dyed, a higher resolution close-up shot may reveal more. What we should be looking for is a close-up of an unused area (reverse cushion side is an example) for testing to see if:
a) a lightening up of a leather structure pull or stretch to determine if the leather is pull-up type,
b) Erasing the surface of the same unused area to reveal the sheen of the nap to determine if this is nubuck,
c) finger scratching to reveal topcoat coat damages that turns whitish.

With the above test we can then determine if the leather finish type is as follows:

A) Aniline with a Topcoat.
Test with finger scratching will show a whitish damaged topcoat scratch.

B) Aniline Wax Pull Up.
Test with a leather structure pull or stretch will lighten up as the wax dissipate or disperse.

C) Nubuck
Test with Eraser-4 will reveal a lively velvety sheen or a finger writing effect.

D) Nubuck Wax Pull-Up
Test with a leather structure pull or stretch will lighten up as the wax dissipate or disperse with a velvety sheen or finger writing effect.


Roger Koh
Leather Care Consultant
www.LeatherDoctor.com