A little awkward, but one thing to do after urinating, while still sitting on the toilet, is to pour some warm water "down there," then (standing up) wash up with a clean wet washcloth (or small hand towel) and plain mild soap after that (standing up). (Guys definitely have it easier when it comes to washing/cleaning after BCG.) Keep a supply of fresh washcloths handy, and use a new one each time; you can later launder the wash cloths and towels in hot water with a bit of chlorine bleach.
We're fortunate in that we have a 1/2 bath that's designated as mine for the day. (It's is also the cat's bathroom, where his litter box is, but he's willing to share the room with me.)
Ann
Small TA Grade 1, May-06; recur (2 tiny), same, June-08; TURBTs both times. BCG begun July-08, dosage to 1/3rd May-10, completed treatment December-11. All clear since 2008.