"Keep DRY."

       They said NOTHING about "clean".  
Did you ever have a Plaster cast & use your School Ruler, a knitting needle, or similar; to reach where there was no room for Fingers?
       I've just had it under the bandage - AND - safely, on the back of the Hand; a Dessert Fork did the trick perfectly.
       For the record - while undoubtedly stained - the actual does NOT look anything like as dark/dirty as the Photo implies.