What is it, you may ask? When I was still living at home, it would drive me crazy when my mom would fill up the soap dispenser with water to make that last little bit of soap accessible. Why? Not knowing any better, I purely thought it was cheap. Why couldn't you just buy new soap? Why try to use it all??
Now I get it. Groceries are expensive and I want to get every last drop out of everything we buy. I'm turning into my mother.