Wouldnt use one personally anymore. Had the Subaru Detailed and was asked did I use one only they scratch your car. I have Turtle one.
This is done one month after Detail by myself, I just go for a drive to get excess water off then use a Meguiars cloth to take the rest of water off and then polish with NXT.
This is actually a Jet Stream not a scratch.
This is a reflection of The Moon in my bonnet.