The stuff i use comes in 5 gallon drums and is not sold to normal consumers. It contains DICHLOROMETHANE and PHENOL.
MIL SPEC. IS. MIL-R-81294D
It's old an possibly not available anymore.
I did have some aerosol "Bowman" brand that contained METHYLENE CHLORIDE, that was bad a$$ stuff too.
polyurethane removerThis is current product