Lacquer thinner?
Butane/propane.
The local recycle center frequently has dumpsters with lots of small probane bottles (1 #) and butane cylinders (unknown size; probably 6 Oz). It’s not uncommon for a house to nearly evaporate from the explosive power of these fuels going off. I think they heat the mix to drive off the excess solvent and ignore the issues.
Property owner in Jefferson. The last hope of CA.