Question: How to remove difficult decals.

  Options: 
 A. Spray the decals and the surrounding areas with WD-40, lifting the edges to get underneath, if possible. Let sit, then gently scrape away the decal with the edge of a cookie sheet. Degrease the tub with liquid dishwashing soap.
 B. Spray the decals and the surrounding areas with WD-40, lifting the edges to get underneath, if possible. Let sit, then gently scrape away the decal with the edge of a credit card. Degrease the tub with liquid dishwashing soap.
Answer: B