So far, I have made 4 batches of soap. When I make them, I add all my oils to a plastic dollar tree mixing bowl and melt them in the microwave. Today, I started to wonder if this was the best idea? The reason I do it that way, is to keep all my soaping supplies separate (my OCD mind doesn't want to use any of my cooking stuff for soap- even if it is stainless and supposed to be ok).