Sir, do not use a Scotch brite pad ANYWHERE NEAR THE EXPOSED CYLINDERS! It leaves behind abrasive. It'll RUIN things.

I used a gasket scraper, and a vacuum to ensure I sucked all the debris out of the cylinders, even after stuffing them with rags. We used to use a stone to "stone" the deck as well. I wouldnt muck with the carbon at the cyl tops unless it's severe.

This is "cleanroom" time.