I have several Silcone loaf soap molds. I have three 10" Crafter Choice loaf molds and one tall skinny one from Bramble Berry. After several uses they seem to be more difficult to unmold. The silky smooth finish seems to have diminished. I don't know if this is the problem or not. I clean then in the sink with warm soapy dish water and dry them well. But I still have soap batter residue that remains. Am I doing something wrong? How do others clean their molds and is there a reason why they do not release as well as they did when brand new? I know I could line these molds with freezer paper but I would be defeating the reason I chose silicone molds in the grist place.