Cafiza is the industry standard when it comes to removing oily coffee residue. Soak your parts in it to remove built-up grime, or use it for a daily backflush. (Backflushing is when you force water ...

But despite my mechanical inexperience, I managed to find, clean and restore a 15-year-old Gaggia Classic espresso machine ... the boiler, the pump and more; or you can settle for something ...