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@bombcup
I really wouldn't use vinegar, I imagine the taste would linger forever. Lemon juice would be ok but the flavour is much stronger than citric acid granules and the concentration is impossible to determine.
Citric acid is easy to come by, get it at health food stores, homebrew places, or easiest of all at Tesco under the guise of washing machine descaler. Mix it up at 100g per litre. Don't use it on aluminium boilers, it's too strong, for that you need tartaric acid, also available at homebrew specialists or Gaggia dealers as Gaggia espresso descaler.