Not sure there is a fail safe way but I'm sure someone will offer suggestions. I have yet to find a solution. I've been told easy off works, going to try it on a painted sign that has been painted over. Good luck.
Have gas all the time
Please use For Sale forums to sell
Please - NO offers to Buy or Sell in this forum category
Statements such as, "I'm thinking about selling this." are considered an offer to sell.