pet the soap

When you are in a bathroom that has only provided bar soap and your hands are wet, you don't want to pick up the soap because it will slip out of your hands, so you just pet the soap a little and hope that some of the soap essence will rub off.

Connie: Excuse me, I have to pee.
(Connie returns shortly after.)
Angelina: What was the bathroom like? I heard they spent a fortune remodeling it.
Connie: Yeah, it was very posh, and apparently pump-action is now too pedestrian for them. Had to pet the soap.
Angelina: Oh, I hate that.