Magic erasers. I'm in a Kroger so we just go get the name brand shit and transfer it to our supplies. I've tried everything, this is the only thing that works, I use the bathroom scrubber ones.

Edit: I will also say, however, that you can and should just order new boards if the old ones are really bad. No shame, it's just like ordering new pitchers.

I have literally scrubbed them with a scrubby with a handle for extra pressure and dawn dish soap and hot water and it doesnt come off. I keep flipping the boards upside down and backwards.

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The graffiti remover sucks all it does is give me a headache the only thing that works is scrubbing with restroom cleaner