I drain the black tank while running the flush connection into it (BTW ALWAYS use a dedicated hose, not your drinking hose) then once mostly drained I'll close the black valve for a few minutes with water still running into it, NEVER leave unattended, then open & you'll get the rush your looking for. I'll do this a few times, add a squirt of dish/laundry soap, fill/drain a couple more times til no suds, done.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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