Whizzy Wheel would really help here.

https://www.amazon.com/Whizzy-Wheel-Sticker-Remover-Adapter/dp/B00FJF0O2K

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I haven't tried the generic ones though.

Ive used one a few times:

(https://www.amazon.com/Whizzy-Wheel-Sticker-Remover-Adapter/dp/B00FJF0O2K/ref=sr_1_3_sspa?keywords=3m+eraser+wheel&pd_rd_r=0a9f7541-1a45-45ff-b163-c6cfab173a0e&pd_rd_w=dQLT6&pd_rd_wg=DYqgw&pf_rd_p=7be70e42-b5c0-4077-873a-35a472a6fbd4&pf_rd_r=TN1R5CFFCVTP7YSH9NFG&qid=1569271761&s=gateway&sr=8-3-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzUEs2R1pMWkdYQ1o1JmVuY3J5cHRlZElkPUEwNjM0MTAxMkpLN1hVUFcyTlQxSSZlbmNyeXB0ZWRBZElkPUEwODk5MDg0TkZNTzVXR0RSSVhFJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==)

They make a big mess (imagine using a pencil eraser x 1000), but get they job done. They mark up the wall a little, but not enough you should have to patch it.

Is this what you're talking about?

https://www.amazon.com/dp/B00FJF0O2K/ref=cm_sw_r_cp_apa_i_GNdJFbDHM3W9V