Andrew Gabriel wrote:
"David Lang" writes:

Strong Hydrochloric acid can damage the glaze! I know,
I've done it!

I know it wrecks the glaze on enamelled metalwork (e.g.
baths), but on glazed porcelain?

I've never seen glaze damaged from this treatment - maybe
very old sanitary ware with different glaze might suffer?
Brick cleaner isn't "strong" hydrochloric acid, anyway.

What of cleaners available from supermarkets that contain
hydrochloric acid? I can't recall seeing any warnings on
the labels about this....


Also wondered what damage it does to the cemented joins
in sewer pipes...

That's why you flush the lavatory a few times after!