Since some building work a few years ago I've had a nearly-full 25 litre container of brick acid hanging around and my ancient A level chemistry knowledge isn't helping me to think of anything useful to do with it. Are there any suggestions? or should I just give it to the first builder I see ;-)
If fairly dilute hydrochloric acid can damage the glaze then I'd suggest it was already quite far gone.
What really matters if you're using it with bleach, is DON'T. Hypochlorite bleach and hydrochloric acid release chlorine. Many year ago I saw an emergency trachaeotomy done on a French student who happend to go into the loo at Hyde Park after such a mix had occured.
I've never seen real builders using it, and an unskilled builder who gets cement where he shouldn't have done probably doesn't even know about it. So I'm not sure who actually buys it. What was yours used for?
I have some which I bought to clean up bricks which I needed to reuse (after someone crashed in to both my gateposts, on different occasions).
It's excellent for cleaning toilet pans in hard water areas (only a tiny amount needed), and makes a very powerful descaler (even when diluted, which you must do), but you have to be sure it's not going to damage anything you use it on, or in its disposal path. However, I wouldn't use it if you have cemented clay or cast iron sewer pipes, and don't let large quantities escape down the drain anyway.
I really wouldn't do this - glaze. You might show up problems on a new pan, if the pan is really old (the gardener's outside) it'll definitely do it and it'll look really dreadful.
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