We like to spray on the panel, and then lightly wipe away the loose grime. Then, respray again and re-wipe. This solves two things. One, it removes the lose concentrated dirt sitting on the top of the surfaces. Two, the second pass cleans up whatever the first pass left behind as it would be very difficult for it all to be cleaned in one pass...similar to the glass cleaning two towel method. Go around the car with this method until all the panels are cleaned. For heavier coiled areas, let the product dwell after the first pass. This will help to breakdown the dirt and grime more rapidly and easily. If you get streaking, simply spritz the panel and wipe the whole panel down again with a third towel. Average use per car: 4oz to 6oz of RTU