like ss20 said , some chemicals get into the pores of the metal and seep out when the metal gets hot . varsol is one of these chemicals. speeking from automotive experence it is not recomended fror cleaning brake drums or disc's ,flywheels or preasure plates or anything that depends on friction to work properly. it does clean dirt and grime very well but imo should not be used on snowmobile clutches. brake clean,contact cleaner or good old soap and water work great imo.