~ i am a huge advocate of the diy quarter carwashes to maintain my cars underside & wheel wells ... it's all about a flexible wand, good pressure and some hot/warm water... a must have for quality end results and really helps fight the dirt build-up.
i can't tell you how many people clean & polish the heck out of cars the paint... but... completely forget the dirt in the wheel wells and underside... and when driving behind a crossfire the underpinnings are very apparent imo... bend down and check your crossfire today... clean um' already!
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... and yes it was driven in the snow & rain.

pics were taken at 40k.