Quote:

Back in the day a company called Aero Chem in SO CA used Hydrofloric(not hydrochloric) acid to chemically mill steel for a lot of SO CA racers, the air quality enviormentalist got that banned in the L.A. basin years ago They bought a plant up (in El Mirage) in the high desert later, if you knew someone that worked thier you could get them to still do it back in the late 1980 and early 1990s that company did a lot of the aerospace milling back in the day, the racer stuff was secondary only



it's "hydrofluoric" and imho not something you want to mess with