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try 1/2 a bottle of coke, and it will be done when u finished drinking the rest..charge for the coke!
 
Spirit of salts bought from cleaning supplies shop 34% hydrochloric acid.
Pour in, wait 30 seconds, hose down at distance, brand new.
 
good luck with trading standars with that one!!
your not supplying what you state/exchange. your cleaning it only so if it splits later they can have you.
it also takes longer so your £85 labour is incorrect
Not what I meant.

New hex £100 (materials) + £85 fitting (labour)

Refurbish hex £50 (labour) + £85 fitting (labour)

AKA, I make more money, they save money and the same result is achieved.
 
I bang them with a big screwdriver handle and them force water through them with the tap head. Then I use some x800 and leave it for a while before repeating. I did it on the Ariston in my house as when I bought the property, the boiler was already in and the hot water was useless. Been fine since. (Runs to touch some wood)!!!
 

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