a product called Turbolene. it is made by bass chemical in uxbridge, mass. about $6.50 or so a gallon. great stuff! cleans wheels, tires, lettering, clothes and dishes (yes! it is true), and is one of the best degreasers i have ever used. also does a great job at prepping paint for complete reconditioning. strips off wax and cleans paint. they also make an acid based cleaner for aluminum and it works great on the frame! gets rid of all dirt and rust! i think that is closer to $20 a gallon though. but you can dillute it 50/50 if you wish.