Carefully cut out the decals you select from the decal sheet using scissors. Decals may include headlights, windows, grill, racing stripes, logos, etc.
Prepare the area where you'll be applying the decal by spraying it with a solution of water and a few drops of dishwashing soap.
Peel the backing off the first decal and position the decal where you want it to go. The slippery soap-and-water solution permits you move the decal around on the plastic surface, straightening and making slight adjustments to the positioning.
Once the decal is positioned just as you want it, gently blot it with a paper towel to remove the excess solution. Gently squeeze out any bubbles that may have gotten trapped beneath the decal. The decal should bond to the surface as it dries.