I use Chemical Guys Maxi Suds II. Very slick, and super concentrated (instead of 1oz per gallon, it's 1/2 oz, so a gallon lasts twice as long as some others).
For OTC, I like the Meg's Gold Class too, I used that until I discovered CGs.
335xi sedan 6MT, Premium, Cold Weather, iDrive, CA, iPod
Black Sapphire Metallic, Black Leather, Aluminum Trim
European Delivery: April 28 - May 7, 2008
Performance Center Redelivery: July 11, 2008