if that doesnt work,
Get adhesive remover, spray the living fuck out of them, wait a bit and try wiping it off with a towel.
If still deosnt work,
Spray MORE adhesive remover, literally soak them with it, and leave it for a few hours or overnight.
I had the issue where my plasti dip on my winter wheels was NOT coming off at all, hell even the power washer didnt really take it all off.
After trying everything and even attempting to sand them down, I sprayed with adhesive remover, and it came off.