Get some diamond grip tape cleaner, that should do the trick.

https://www.amazon.com/dp/B06WP75695?ref=ppx_pop_mob_ap_share

It's grip tape and the skateboard crowned has this covered for a couple decades now. You are looking f gum tape cleaner like this (Amazon) or like this (Aliexpress). In short it's like an eraser, requires a bit of elbow grease and feels like a minor miracle the first couple of times you use it.