Spread a thin layer of butter directly onto the light colored vinyl. Make sure to cover the pen ink stain completely with butter.
Place the vinyl item in a sunny location for at least a few hours.
Wipe the vinyl clean with a soft, damp cloth. Examine the area where the pen ink stain was. If the ink is still there, repeat the process.
Apply hairspray to the pen ink mark. Allow the hairspray to sit on the vinyl for several minutes but not long enough so that it dries.
Rub the area gently with a paper towel. Wipe the vinyl clean with a damp cloth. Check the progress of the stain. If the pen ink is still present, continue to Step 3.
Apply more hairspray to the pen ink mark. Add a drop of liquid dish soap. Rub the dish soap and hairspray into the vinyl with your finger. Wipe clean with a damp cloth.