Step 1: Preparing
There are many ways to remove vinyl lettering. We have found that what is described below works for most situations. You will need the following:
    Hair Dryer or Heat Gun
    Chisel
    Adhesive Remover or Rubbing Alcohol
 
Step 2: Heat Surface
Warm a small section of the vinyl with your heating tool. Do NOT over heat because this may ruin the material your vinyl is attached to. 

Step 3: Chisel and Pull
Slide a chisel under the vinyl on an edge that has been heated. You want to loosen a section of the vinyl so that you are able to pull it up with your fingers. Repeat steps 2 and 3 until the vinyl is completely removed. 

Step 4: Remove Adhesive
After the vinyl has been removed, there may be some adhesive residue on the surface. Using either adhesive remover or rubbing alcohol pour a small amount over the area. Within 40 seconds the adhesive should break up. With a rag rub the adhesive until it has been removed.