Have recently been using Raceglaze 55 polish and the results are superb - www.racegaze.co.uk. I have no connection with this company other than they are quick on delivery. There products are not cheap but then again when as BMW drivers have we been used to cheap products. Raceglaze 55 contains 55% carnuba wax and I have found its best applied in the shade - preferably in the garage where it's reasonably cool. Applied with a foam applicator and removed with a microfibre cloth it leaves an almost glass like and resilient finish (pareticularly if you have clayed before hand).