I have 2 new carboys in my collection that i just bought. They are used and are really really really nasty. They have caked on residue of some kind.
I have tried everything i know.. scrubbing with that "L" shaped brush. STRAIGHT- A CLEANSER. soaking for days.
I evan made some home-made crude drill attached brushes (dowels with zip-ties).
At (my) last resort, i soaked in CLR.
and then washed them out.
Still
Caked on residue.
Should i pitch them can call them a loss? (They wer 5 bucks each. I just hate to to that.)
ideas?