I took my son/daughter and a neighbor kid to a close-by off-road trail area in my wife's truck...
This was before we got into any fun parts:
Hadn't rained in awhile, so VERY little mud left on the truck?
Before the $10 wash
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After - The tire dressing they use r0x0rs. It's been nearly a week, and, while not shiny, the tires are still very black/good looking.
The 'macho' guy in me (he's there...trust me) likes the truck dirty - shows it's at least ATTEMPTED to be worth the price of a 4x4.
But Clean? it looks pretty slick.