What is the best method to remove vinyl from my sign and reapply new to it?
Here is a video found on YouTube that will help you. I wouldn’t use an application fluid with it if it’s an ADL sign (translucent). https://www.youtube.com/watch?v=RSVk0C_NLpc
For removal you just peel the old vinyl off, and clean off any sticky residue that’s left on the sign with alcohol.