Lonnie,I usually just spray it on and let it sit a minute then just rub it off with a clean towel. Don't do it if the sun is hitting it but you shouldn't use the Black Streak removers in the sun either. I don't like using Black Streak removers because they smell like a beach and water mixture and I don't want that on the trailer finish.
Once we get setup at a park I use the detailer on the truck and trailer wheels to clean off the brake dust and give them a nice shine. The detailer will also remove bugs from the front cap.
17 Chevy 3500 DRW 4X4
16 Mobile Suites 36RSSB4
2 Mini Dachshunds