I'll third the phishing line method. Used that and the blow dryer on the sliders. On the rear phender I used heat, and slowly gently pulled them back. Worked the rest of the adhesive off with the heat and my thumb.

Quick & Easy!

Fishing line works great. If you take them off right after you purchase, they will peel off with a little bit elbow grease. Just make sure to protect the paint with some tape...