Cody
The Citrus he uses is ordanary home owner style. It does not hurt my truck paint at all in fact it's not a bad cleaner and shines up the area.
I helped him last time we did it spring, we sprayed the letters and nick one corner and start peeling if needed we spray a fine mist under the letter as your peeling. Once the letters are off we spray any glue stick-um left over and wipe with a clean cloth and we are done and prepped for the new letter to go on.
One thing! My letters only stay on the truck for a maX of 6 Months before I swap out the lettering sizes. Older the tuffer it will be but this is a proven technique.
Here is an excerp from a pro sgin stripping site.
Vinyl Pitfalls
Of course, even if you are aware of and have prepared for the challenges involved in stripping vinyl, there are still some pitfalls that can snare you. The biggest time waster is removing the adhesive residue that is often left behind when the graphics are very old. Removing the residue then requires a special solution and an extra step in the process.
“There’s no wonder product out there,†says Stapleton. “I’ve tried a lot of different things and they all pretty much work the same.â€
Stapleton uses a adhesive remover by 3M. Barbaria’s shop uses Rapid Remover. And Akers’ franchisees use a couple of different products, such as Goo Gone and Goof Off.
“I would start with alcohol, then move to Goo Gone, which is a citrus-based product, then Goof Off, which is used for removing paint from floors,†says Akers. Some sign makers have even gone as far as trying WD-40 with little success.
Here's the website I found it on.
http://www.signindustry.com/vinyl/articles/2002-03-14-JL-StrippingVinyl.php3
Looks like it could be a profitable biz after reading the complete article.
LOL
Good luck
Tim