Soooooo...the GOOD stuff in paint stripper was... "Methylene chloride, also known as dichloromethane or DCM, a solvent used in a range of products. The average consumer is most likely to encounter it in paint strippers, even though safer alternatives exist. Methylene chloride has been linked to cancer, cognitive impairment, and asphyxiation. Numerous people have died from exposure to methylene chloride. In 2017, the U.S. Environmental Protection Agency (EPA) proposed to ban this chemical’s use in paint stripping. In 2019, EPA only finalized the ban on consumer uses and sales".
That blurb, from SaferChemicals.org, explains what happened. People are idiots and need the government to step in and protect them from themselves. So you and I can't buy it, but commercial users CAN. So, make friends with a commercial paint shop or "fhagedaboutit." I tried to buy some from a vendor but they wanted business license numbers and a commercial address to ship it. It can be neutralized with water, but people would splash that $h!t in their eyes and go blind.