Known as the shoddy pad. Rock wool and maybe fiberglass, and I believe kick panel insulation is straight up fiberglass. All silica based, just like asbestos. When I was young, I tried to clean up a pile of silica filter sand with a shop vac. If you can imagine what breathing broken glass is like, that’s about the closest thing I could compare it to. If you choose to vac it out, keep it wet!
