Stuff growing on my fermenter

[Doongie]

This is the first time I have ever seen this. Anyone else? I will try bleaching it before I use it again, but I fear my 20 year old brew buddy may finally kick the bucket. :-(

I fermented at 68 ish inside a black trash can. Maybe I'm crazy, but initial thoughts were the trash can would contain the co2 expelled, and prohibit specifically this. I have been doing this for years, never seen this before.
Tis is the first time I've opened up for a hydrometer reading, maybe that's when it happened?

 

[whoaru99]

My last batch grew a few spots on the outside too. I attributed it to staying damp inside my ferm chamber at a comfortable 68F, and a bit of spilled wort for food.

I just washed it real good with PBW, and will sanitize as usual next batch.