I probably would have used lacquer thinner if anything was necessary, but I remember using WD-40 and a microfiber towel for the final prep. Traditional red shop towels leave lint.Question. After sanding down the mating surfaces, would it be beneficial to wipe down the mating area with Isopropyl Alcohol and a shop towel to make sure there is no oils or dirt on those surfaces? Or should I wipe them off with a dry and clean shop towel? I'm including all exhaust, intake, coolant system, and head gaskets mating surfaces. Would the Isopropyl Alcohol damage any of these gaskets on contact?