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https://kingdomcoffee.co.uk/media/productattach/c/o/coshh_sheet_-_puly_caff_powder_tablets_3.pdf
Sodium sulphate
Sodium carbonate
Sodium percarbonate(I'm not a chemist but) sodium hydroxide isn't listed and I presume it would be as it's hazardous?
frankenbike
gbj_tester
Puly Caff is what you use to dissolve all that residue off espresso machines. Steriliser tablets are are ok for water bottles etc, but they are just bleach and won’t dissolve off the stuck-on coffee and milk scale. Neither will descaler powder. You need something like Puly Caff which is a mix of detergent and [they don’t say what it is but it’s probably] sodium hydroxide.