I have the little windshield scrubber squeegee things at the entrance to all of my IBAs. I just fill the bucket with FB soap straight from the tank. I see people using it on their windshields often, but sometimes they use it for loosening the bugs on the fronts of their cars. I think this works well, because it's too inconvenient for them to scrub down large portions of their car, or their wheels. They only cost a little over $2 apiece so it's no big deal if someone carries one off. That being said, I replace more from being worn out, than ones that walk off.