I use Poorboys World Spray & Wipe Waterless Wash. I bought a huge jug of it on ebay for $38 w/free shipping. I leave a 16 oz bottle in the trunk with a bunch of microfiber towels. Every few days I like to give wheels a quick spray and wipe down... works perfect for me.
http://www.detailedimage.com/Poorboy...-P32/16-oz-S1/
http://www.ebay.com/itm/161054726530...84.m1423.l2649