Forget a chamios, old technology and dont use "an old cloth" to dry your car, more than likely mark your paint.
Try something like this as your drying towel
http://cgi.ebay.co.uk/Sonus-Der-Wunder-Dry...p3286.m20.l1116
Dont use more then the specified amount of shampoo, to much will cause streaking, try not to wash in the sun or on hot days aswell.
Pressure is good to get the intial muck off, then use a wash mitt and bucket, then rinse with a hose to sheet off the excess water and finally use your drying towel. job done.