Chris J Dixon wrote:

After my kitchen mixer has been in place about 7 years, both hot
and cold began to drip. I opened them up, more in hope than
expectation, but I found scale deposits on the ceramic disc,
which were quite easily removed, and all was well.

OTOH the other day I decided to descale the filter on the washing
machine. Darned thing started leaking afterwards... after a few
days it did stop, though.