Well I found a couple videos on Youtube one with the dry ice and another with the canned air. Enjoy
http://youtube.com/watch?v=w2R3QQejj...elated&search=
http://youtube.com/watch?v=4rIKo6241...elated&search=
Canned air would probably work better for large areas and dry ice for hail damage or smaller dents as it is much colder. Im going to try both when I get everything together. Wish me luck