Hi curry lover40. If you have a Brillo pad or similar then giving it a good scrub in hot soapy water will make sure it's ok I'm sure.

Welcome to the forum currylover40
NJ is spot on with the good old Brillo pad.
I generally scrub up my alu pans to a chrome finish once a week.
Heat oil till smoking, then discard and wipe,

the onions and curry will just glide.
cheers Chewy

Hi Currylover,

We have had this problem before at Curry 2 Go, one of the lads I had working for me (pot washer) put bleach in the
water. I found (as has already been suggested ) that if you scrub the pan with very hot soapy water and apply a bit of elbow grease it will come right-  all nice an shiny again.

Hi All,
             I'm quite happy using the aluminium pan, it's so much better than a non-stick. The concern I have is using it in conjunction with a metal chef's spoon. I don't know if anyone else has noticed but using the scraping technique definitely produces a residue from the pan. You can test this by scraping the pan with the chef's spoon without any sauce/curry and you will find, by wiping the surface of the pan with a paper towel, a black/silver residue on the towel; I'm not sure if this is good. I have since started using a wooden spoon (I've seen it used in a Chewytikka video) I can't see using wood over steel as a problem. Any thoughts on this?

Cheers

.......and yet every vid you see of BIR kitchen shows metal chef spoon used in ali pan.