/ck/ - Food & Cooking

I bought a 2nd hand Gaggia. There's rust above where the water tank sits and I've noticed particles falling into the tank.

I've tried using Autosol Metal Life Saver and scrubbing it until no more rust came off but a week later when I wipe the area more rust comes off.

Do I need to use some form of rust converter product (I thought Metal Life Saver might of done this)?
How can I prevent this getting worse and particles falling into the tank?