[Richard]

Bob,

This is just my .02. If I were just trying to clear the debris in the washer, I would either disconnect the washer supply lines at the manifold or shut the rest of the coach off at the manifold so that I could circulate vinegar in the washer lines only. If you used the manifold, you could valve out everything and every tank, then disconnect the inlet to the 12v water pump and use the inlet hose as a pickup tube for the vinegar bottles.

Vinegar is acetic acid which will dissolve calcium.

It may have some unintended consequences. First, it may break even sediment loose from the lines. So you may end up removing the washer anyhoo to get to the valve. Second, rinse, rinse, rinse the washing machine afterwards to prevent any rusting.

I personally would not put any substance in my tanks or lines that could impart a lingering taste to the drinking water. That is why I advocate isolating everything but the washer.

Also, Rudy can tell you more, but a big source of sediment is deposits that form in the aquahot and break loose to circulate. I have seen a procedure where the AH is flushed with vinegar to remove the sediment inside the heating coil.