Re: Galvanized ceiling
Do you really mean galvanized sheet metal or embossed tin ceiling panels?
My 2¢..Galvanized sheet metal isn't that good looking and they will dull easily. I do not know good cleaner to bring back original shine, even if you or someone "claim" there are cleaners on the market will do the job but galvanized metal shows residues from cleaners very easily.
"Life does not go by the book, we learn as we go along".
You only need two tools in life - WD-40 and Duct Tape.
If it doesn't move and should, use WD-40.
If it shouldn't move and does, use the Duct Tape.