I'm laughing as I read this, because back in my youth (early 70's) I worked at a car wash. We had this "stuff" (chemical) we called "elephant p---" because it was lime green. We'd mix a powder with water in one of those pump up spray cans, and after covering the white walls on the cars with it, we spray it off with the high pressure water spray guns we had. The white walls/lettering would clean up like new, and it was quick and easy. I'm laughing because I'm sure whatever it was we were using has been banned by the EPA by now. But boy, it really worked. I use Wesley's Bleach white now as well, but it does not compare the "stuff" we used back then at the car wash. Maybe I'm lucky to still be here, ha ha!!