A bigger question is Why Worry About It?? It dosn't hurt anything. I have used a crock pot to clean old engines before a rebuild but if you don't have a number of engines it isn't worth the time or money. One club I used to belong to had the pot and AF for members to use if they wanted. Usually got used just before an auction to clean up old engines that were going to be sold. Bet that made the light bulb come on over a few heads, thinking about that almost NIB they bought and why it didn't run so well when they got it home.[8D]