I wouldn't worry too much about the detergent you use. I think Simple Green in water or a good automotive detergent such as Meguiars Gold Class would be fine. Some people have used pressure washers too - that's something I'd be careful with. If you have a pressure washer that can deliver a fairly gentle spray, it would be ok.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew