My washbasin was blocked. My reliable plumber was abroad and it was just before Christmas.I fished around in my garage for some caustic soda I'd had for years. I stuffed it down the plughole until it reached the top, and put the plug in.Nothing happened until about 2 a.m.the following day when there was a frightening thud and gurgling noise which woke us up.I thought the pipe had burst. but no, it was clear. Dangerous stuff but worth keeping in stock....and so cheap.
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