Anybody tried equal parts vinegar & dawn dish soap? It works great for renewing wiper blades after they get really filthy. I put it on a rag and scrub them back and forth a few times. You could rinse it off after, but I usually just run my washers. I know some cleaners containing oils can actually harm rubber. And I have white tires, but I haven't yet tried the vinegar/dawn on them yet.
I have a little one, so we have lots of baby wipes kicking around. I've been using them for touch ups, but I really need to knuckle down and scrub mine.