Read mass posts of people power washing, putting a lawn sprinkler under them, and driving thru car washes. Back around 2004 I made a bubba undercarriage washer for a Dodge truck I drove on the beach almost every day. Then used it on my Jeep up till I bought my Tacoma. I made it out of some old PVC pipe and fittings I had laying around. Last month the hose fitting finally broke off. I figured it was time for a couple upgrades. Added a water cut off valve, quick detach, and a 90 degree elbow so it would be more comfortable to use. It was also but ugly so I sprayed it down with a can of blue paint I had on a shelf. Still ugly, but works better than anything I've seen, and has been going strong for 15 years. I was gonna trash it and make a new one out of 3/4" schedule 80 PVC pipe, but it kinda has sentimental values now.