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@rodabod
I'd recommend citric acid for use on aluminium boilers. You can buy it cheaply on eBay.
I managed to break the boiler element on my "new" espresso machine (an Expobar Office) by descaling it with a strong solution which somehow caused the element to develop a short. It has literally taken me most of my week off work to entirely strip the whole machine and re-assemble with a new element. The boiler was full of crap, but is thankfully clean now.
I wouldn't recommend buying an ex-commercial machine (or a well used domestic one) if they haven't used soft water. I'll be sticking with the Tesco Ashbeck or whatever it's called. Tastes better anyway.