That crap is called undercoating. You being in Michigan should know what that is. As someone who grew out in the Pacific NW, I got introduced to that stuff when I was stationed in Michigan (old Wurtsmith AFB). You used to be able to buy it in a spray can. I haven't seen any in awhile.
It's similar to tar sealant used on concrete foundations, and will take awhile to set up.
Go to the second hand store and buy a shirt/jeans that you can throw away when you're done with your clutch job. About the only thing that'll clean it off your skin is gasoline.
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