Hmmm, sounds familiar.
I knew a fellow (shade tree mechanic) in KC Missouri.
He used a water trough half full of diesel to clean parts.
All the carburetor cleaner, paint, thinner and other chemicals, where dumped in the water trough.
When it would not clean parts any longer; he would drain the tank through a filter, mix it 50/50 with fresh diesel and use it in his truck.
That truck made a smell which could make anyone vomit.