I wash my cars every weekend and top up the wax about every 1.5 months. The Coup De Grace detail is put off for as long as possible and done once a year - twice if really warranted. This includes the following steps: … High pressure hose down with my Karcher to remove large debris 2. Notice the water beading nicely – a sign showing that a good amount of wax is still protecting the car – this needs to be removed completely before any polishing can be started. …