I don't know why I didn't figure this out sooner. I use shampoo in the shower and when I wash my hair the shampoo runs down my whole body. Printed clearly on the shampoo label is the warning, "for extra body and volume." No wonder I have been gaining weight.
Well, I've gotten rid of that shampoo and am going to start shampooing with Dawn dish soap. Its label reads, "dissolves fat that is otherwise difficult to remove."
Hat tip: ♥♥Hubby♥♥