We've lived/traveled where the water was extremely hard & have never experienced it so bad that it plugged the lines. Seems it would've had to sit with a good amount of water left in the lines long enough to dry completely out for it to get that bad.
Are you sure the water heater bypass valves are properly aligned to get to the faucets?
Have you removed & checked that the check valve that's on the top out flow line on the water heater is not plugged or stuck shut?
If the vinegar doesn't work I'd be a bit hesitant to use anything much stronger, you are dealing with a rv that the cheapest products on earth were used to build it, so what would something stronger do to the lines, their fittings or the faucets.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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