Not sure where I read this, but in a forum post somewhere. The poster had taken their 5th wheel through one of those truck washes, and discovered afterward that the high pressure water had entered their furnace and damaged something in the burner. You have your furnace, water heater, and your frig that are not well protected from the elements under ideal conditions, but definitely not from high pressure water. And as has been stated, you will have all kinds of things come loose from the wash. I won't even consider a portable pressure washer for the same reasons. Long extendable brush and good car wash/RV soap is all that is needed, except for the bugs that stick to the front, and there are cleaners for that also.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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