How do you clean the leftover lather? I have just switched from using The Art of Shaving Sandalwood Shaving Cream, which I loved, but did not like the ingredients in it. I have decided to start using natural soaps and got some from Soaptopia. I grated it into my own bowl and have found the soap provides a very nice lather and like it a lot. I do not know what to do with the soap when I am done though. For now, I spash some water in the bowl to get the extra lather out. I don't know if over time this will hurt the life of the soap. What do you all do to clean your mug/bowl after you shave? Thanks!