easy DCM source
Bix varnish and stain stripper is over 25-40% dcm, and costs around $20 a gallon
there is also a large concentration of methanol and acetone.
distilling a gallon of the stuff yielded over a liter of reasonably pure DCM, and about 2 liters of acetone/methanol mix which i use for cleaning
for the price, it seems worth it
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