I agree -- no WD-40.
The peanut butter is a new one on me and I am filing that away for future use
I use Dawn dish soap on all my horses' legs 2-3 nights a week for scratches. It not only helps get a day's worth of grimy diaper rash cream off, it seems to dry out the scratches and they heal faster.
Just have to remember to rinse more thoroughly than normal since it's dishsoap and not horse shampoo