Maybe stick it in a bucket (plastic) of citric acid overnight?
Or anything that gets limescale out of a toilet bowl?
We don't have that problem on Dartmoor - especially as my water (if you
pardon the expression) comes from a hole* in the garden..So I am just
I use 8-12 mm deep ordinary malt vinegar in a plastic large coffee-jar lid.
Soak perforated rose overnight, and rinse out bits later.
But don't know what happens to limescale deposits accruing in 8kW shower
heat exchanger, though.... this build-up must reduce its bore.
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