You are accomplishing nothing, you need to vacuum the car at least before you start using that machine. Your sucking up dirt, rocks, and debris into your machine. Maybe try reading the instructions on your equipment before you use it. And I guarantee you if you would use that machine the way it was supposed to be used, you would get a better reaction from your customers than just meh, that looks okay. Study your methods and fix them to give your customer a better product before you build yourself a reputation you can't fix.
