Daisy Jo wrote a post about toothpaste. I shall do one about soap.
While I am fairly brand loyal, I don't have any brand loyalty to soap. I have tried the lot. My latest is oatmeal. It is quite spikey with bits sticking out of it to abrade one's ultra smooth body. I have heard that it can be used for kinky sexual purposes. No idea how. It is also disappearing very quickly. It just melts away. You do have to be a bit careful with it on your tender parts.