Citric acid

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I bought some Grohe shower cleaner as that was the only one recommend by Grohe when we had a new shower fitted. It sells for the remarkable price of £15.
I downloaded the COSH sheet for it and noted that the only active ingredient is citric acid.
Citric acid sells for around £5-10 per kg in crystal form (even food grade).
Diluted 3 table spoons to 0.5 litre in a spray bottle it seems to achieve the same results as the Grohe. I.e. spray the shower screen and chrome after each shower and it stays totally free of limscale and shiny with practically no effort.
Not sure this is the right board: I imagine it is greener than most chemical cleaners, and it seems very unethical for it to be sold at such an obscene markup.
I downloaded the COSH sheet for it and noted that the only active ingredient is citric acid.
Citric acid sells for around £5-10 per kg in crystal form (even food grade).
Diluted 3 table spoons to 0.5 litre in a spray bottle it seems to achieve the same results as the Grohe. I.e. spray the shower screen and chrome after each shower and it stays totally free of limscale and shiny with practically no effort.
Not sure this is the right board: I imagine it is greener than most chemical cleaners, and it seems very unethical for it to be sold at such an obscene markup.
5
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As Eric says, it's not like some other acids which burn and etch stuff,