"Bob Eager" wrote:
We have a quantity of hardened soap powder (at least, I assume that's
what it is) in the soap powder tray, and in the recess it fits into.
This is an old Hotpoint.

It's causing problems moving the tray; it's very hard to scrape off. Any
useful tips on removing it?

I'd rather avoid the thermic lance...
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Assuming it is a mixture of detergent and limescale, you could try soaking
it in citric acid washing machine descaler. If you live near a Waitrose shop
they do their own Ultima brand washing machine descaler for about 2.60 GPP
for a 250g packet.

Phil