Yes, a clay bar should be used right away and on at least an annual basis. You will need to strip the wax before use. I recently went over mine with a new clay bar, then used the Porter Cable and 3M Finesse It Machine Polish, then a couple of coats of Klasse all in one. My goal was to try and remove all of the swirls left from the "detailers" work at the dealership. Definitelt looks better but it is a constant struggle to keep it looking good. Mine sits outside overnight as it will not fit in the garage. No rain here in over 3 months just lots of dust.