I’ve always used a shop vac and a clear thin hose attached to the vac and tried to suck out all the gunk that I could. With the way the W/H’s are made the large lip tends to catch everything when it drains. It would be nice if they were made with the drain at the low point IMHO!
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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