You might be better off just using a low pressure hose to just get all the dirt/mud out and to push it out the drain holes, using a brush or rag to scrub the nasty stuff if needed. Jeeps are pretty much designed to be left in the rain with the tops down, thats why they have drain plugs in the floor. At the same time I wouldn't want to spray any high pressure water into the dash, just in case.
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