Stop over spraying.
Product usage is key to staying profitable. Fine mist sprayers also help products like detail sprays and glass cleaners perform better when less product comes through each spray.
Sprayer is equipped with an on/off so you can keep it in your door panel without worrying about drizzle. The back label has an area to identify what's in the bottle so you can work efficiently.
You'll probably find other cool uses for it. Enjoy and properly shine.