I start with just a scraper. After this many years, a lot of it is loose enough to scrape off. If I need to remove more stubborn stuff, mineral spirits will soften it, or if it isn't a lot and you're impatient like me, brake cleaner dissolves it quickly and wipes off with a rag.

propane torch and a putty knife worked for me.

Anyone ever hear of Dry Ice blasting? There is a place in Elko that rents equipment..

youtu.be/oTUY5GSzPD0

I found a place that does the dry ice blasting out of Elko, MN... They are a mobile company and the estimate on rental of equipment was $500 for the unit for the day, about $400 in dry ice and you need about a 50 horse screw compressor .. He said he thought to have them do it might actually be a push as far as price.. He explained that the screw compressor puts out about 100DB .. Probably not the greatest thing to have running in a residential neighborhood. So total on the estimate was $800 to $1000.. Id love to try it .. Its just not in the budget.

Anyone know when manufactures stopped putting asbestos in their factory undercoating?

I would say 1980 is a good figure to go by... I found this in a research paper..

"Ninety-eight percent of asbestos consumed in the production of asphalt-based undercoating are chrysotile fibers, and constitute less than 10% of the total volume of the material . Application and removal of asbestos containing sealants are considered relatively safe due to the affinity asbestos fibers have for petro-based chemicals. Asbestos fibers directly bind with the asphalt component of the sealants, and become suspended in the matrix . Liberation of independent fibers is believed to be limited, and does not represent an occupational health hazard."

Im wearing an organic vapor mask now matter what.. I cant believe sucking in any of that dust is good for you.

Tony skip the Ice Blasting it may work but unless it is the same unit as I used to use forget it. You need HUGE AIR supplies for that thing and a few containers of dry ice. A heat gun and scraper will do a lot in short time. It took Mike and his brother a day with a heat gun followed by the wire wheel on the Chevelle.