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When I realised that kettle descaler sachets are just citric acid solution
Are they all citric? I got the impression that some of them are tartaric acid (I can't remember why). After I've run one through my espresso machine it goes into my kettle and then to descale the sink, so they're pretty effective. Hadn't thought about putting one in my washing machine.
ffm
The citric acid trick can be very useful if you've got limescale build up that is harbouring smelly bacteria but you need to use loads of it. More than a typical kitchen pot of it.
When I realised that kettle descaler sachets are just citric acid solution, I started buying 2kg bags of citric acid for descaling our kettle, coffee machine, washing machine, dishwasher, shower heads etc etc. Much cheaper that way.
I tend to run an empty citric acid load through our washing machine once every three or four months or so.