Thank you Roger.

Here are some photos before and after. There was considerable material stuck on the couch and I spent a lot of time removing the debris via step 1 (cleaner, eraser, scrub brush). Then did degreaser and all looked good. Next I used the acidifier but the stickiness I found never went away. After drying I used the sandpaper.

All felt smooth, no debris but it was still sticky.

Then is used crosslinker with the bicast as per instructions and left overnight.

Still sticky.

Finally I used the protector-b, still sticky.

Thank you for your assistance,

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Rob