thermal epoxy was popular, cant tell what the real color of the stuff in the image is, as EVERYTHING is orange. Might just be the pink bubble gum stuff, or the white epoxy, or the grey, also bubble gum style hardened paste Yes cleaning it is essential though, scrap what you can and acetone to remove it. (pour the acetone on a coffee filter and rub. rinse and repaet a dozen times.. after tou flcik off what you can with a plastic scrapper) Coffee filters, the enthusiasts/poormans lint free wipes you can go to wally world and get like 500 for $2. Or go to an electronics shop and by $5+ for 50.