I propose a system that will give the hottest water,
How about welding a housing around the muffler/headers
that holds 15 gallons h2o or so. After about 2 hours
of driving just open the tap , pour on and boil your
skin off.

summers in florida will melt the plastic off your
solar-
shower. I put 2 plastic milk jugs of water in a cooler
full of ice and then i dump the water over my head.

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