What will get this stain out?

[rrogerstwo]

I have this stain in my fermenter and do not know how to get it out. Tried PBW, Five Star acid#6, Bar Keepers. Any ideas???

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[Stealthcruiser]

What did you leave sitting in it?

 

[rrogerstwo]

Did a pumpkin brew last. Nothing sits in it otherwise.

 

[poislb]

Never seen that on SS before. Try a PBW soak again and then scrub it with a mr clean magic eraser with bar keepers..

 

[helibrewer]

You may have to go with a caustic on that mess.