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.
Was: 2008 335xi sedan 6MT Black Sapphire Metallic
Is: 2013 Fiat 500 Abarth Nero (black metallic)