i've had "D'B" done to x3 of my cars and it does make a difference the key thing to get the best out of it is by using the shampoo & conserver with it, its designed to work with the stage 1 & 2 that would of been applied to your car when it was done, it can also be used neat on stubbern bits also tar etc. Thats my experience with it and its been a silver sccoby, red mk2 leon and also black vrs octy.