There is a grey putty/glue under the carpet that I just took up and I don't know how to take it off Any ideas?

I was woundering if anyone knew how to remove this or have ever had this problem?

Answers:
Use acid to remove it but becarfull
it's dangerous.

Other answers:
Maybe use water or alcohol. I DON"T KNOW!
Maybe use water or alcohol. I DON"T KNOW!
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