Another car, chicago, uhhh 300d turbo w/4 speed manual
Another car, chicago, uhhh 300d turbo w/4 speed manual
a big aggressive wire wheel on the end of an angle grinder will cut through the undercoating like butter.
You need a mask and protection though, it will throw a lot of hot rubber all over, and some of that will stick to other surfaces. A wire wheel on a drill wont cut it.
I have read of people using a heat gun also, but no personal experience on that