Re: Cleaning Stargate hookah
I had a stargate and it never turned blue. The top where the bowl screwed onto the stem, did get a little oxidation (more like greenish white), but I just cleaned it with hot water, soap and water.
You could try polishing it to make the spots go away.
GLaDOS: "You euthanised your faithful companion cube more quickly than any test subject on record. Congratulations!"