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Well, I heard tonight that he cleared it. He bought a bottle of Sulphuric Acid (sold as a outside drain cleaner) from an ironmonger or 'homeware' store. The first small drop didn't do much, maybe because it was diluted by the water sitting in the trap, so he poured some more in and just...

Thanks, I'll pass that on. Was my idea of vinegar any good (my Chemistry knowledge has been left behind in long past school days)? I was thinking of acid versus alkali.

OK, thought I start a fresh thread for this.... A friend of mine (honestly!) has put some caustic soda down his shower drain, forgot about it (!!!) and now it has solidified and water isn't shifting it. Do you know what will dissolve it? I have sugested vinegar and advised him to beware of...