I do not what is best but I have some hints. If anything such as dash,instruments,wiring, ect are left on the car the media will find it. Remove it all first or you will have to do it later and clean it. Plus after you blow it with compressed air, vacuum it 4 times. still wear goggles when you drive it for a while and be prepared to get it out of your ears ,nose and teeth. And by the way spraying with water 5 times will not help.