I use the P21S Wheel Gel and have been very happy with it. I also use Poorboy's World Wheel Sealant and it is amazing. Brake dust rinses away with water.
2008 335xi Coupe - Sparkling Graphite - Black - Aluminum - AT - Cold - Sports - iPod/USB - BMW Assist - CA - Paddle Shifters
MODS: 18% Suntek Carbon Tint - 19" VMR V710 - 235/265 Bridgestone RE050A Pole Position - KW V3 - Borla Racing Pipes and Cat Backs - AFE CAI - AMS FMIC - ARD O/C - JB3 2.0