On 21/04/2019 14:21, Max Demian wrote:
On 21/04/2019 11:15, Another John wrote:
Having a mug of tea with a mate the other day, I bemoaned the fact that
my beautiful mug (on the outside) had acquired brown stains (on the
inside) which can't be removed using the normal nylon scouring sponge.

He said his Mum used to bleach their cups on a regular basis. I'd heard
of this before, but I've never gone near the idea, for fear of poisoning
myself.

What does The Team Think, please?

Na2CO3.10H2O

Yes. Washing soda is cheap and effective for lots of things, it's often
not in supermarkets because there's far more money to be made selling
coloured fragranced stuff with silly names.

Likewise descalers, citric acid (and others) is inexpensive and just
fine, it works without the coloured plastic bottle and again, silly
name, but you won't usually find it in the supermarket.

Like trying to buy a normal safety razor in Boots. All there is is an
array of less-effective as-seen-on-TV plastic multi-blade disposables at
exorbitant prices.

Cheers
--
Clive