I use a chamois to dry my 540iA. I think it is still the preferred drying method although I'm no expert. I just got a 540iA and washed it for the 1st time. I tried Rainex car wash. It claims that you don't need to wipe it dry. Just wondered if anyone else had tried it or what else would be good to use. Is the chamois still the best to wipe a car dry?