I've sourced a cheap used Gaggia, which I'm trying to clean up for a friend. I'm used to rebuilding proper machines with proper boilers, but this Gaggia has a boiler in bad shape, and I'm not sure if it's worth keeping.

I've seen some mention that one can use white vinegar, but the vinegar bottle explicitly states not to use on aluminium. I've tried citric acid in various concentrations, but it doesn't seems to come out clean enough.
Is this boiler past it?
I've seen some mention that one can use white vinegar, but the vinegar bottle explicitly states not to use on aluminium. I've tried citric acid in various concentrations, but it doesn't seems to come out clean enough.
Is this boiler past it?

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