I use it all the time or once a month at least after giving the car wash down and after using car shampoo .The bar cleanes off all the micro particles and residues that stick to the cars paint work leaving a mirror finish preparing paintwork for waxing so yes it does work and the more you use it the easier it gets and better the paintwork looks so treat your your car ,one of the best on the market is by Bilt Hammer (01277 658899)