Basically ive got a 2001 reg focus panther black, wash it, shammy it off, and then i polish it with autoglym super resin, and it looks mint.

Then during the course of the week it gets dirty as its my daily car, so on the weekend i wash it again, always rinse it, get the grit off so it doesnt create swirl marks etc, but what annoys me is basically i wash it, polish it, it looks mint, it gets dirty a week later i wash it again shammy it off and it looks awful, all the swirl marks and little scuffs i managed to buff out with the autoglym seem to re appear, it must have had had 3 coats of black t cut and about 15 coats of resin polish and the paintwork still feels gritty and rough in areas to feel?

Am i using the wrong polish? Or do i need a sealant or something to keep the shine/good condition after the resin polish? Can anyone recommend me something, as everytime i wash it i have to polish it, otherwise it just looks rough..

Thanks