Washing a lap protector?

Soak the pee area with vinegar or pet cleaner (stain and odour remover) then rinse under a hot tap and hang up to dry. I tend to only clean mine once a week or fortnight, and if it gets peed on (which isn't often at all) in between, I just put a few drops of pet stain remover on it then pat dry with paper towel and hang to dry well.