


Unless the blobs are some gel solvent they used for removal before prying them off with a shovel, i’d say it’s some form of contact cement.
A little patience and some isopropyl, maybe a heat gun would have likely let them remove it without harm. Whoever did the removal wasn’t trying to be careful, they gauged it as someone else’s problem.

One point would be WalMart has 2B in lobby money to make it stop