The person who recites Surah Kahf on Fridays, a light will appear for him from below the throne as high as the skies. This light will help him in the darkness of the day of resurrection . And all the sins which he may have committed from the last Friday till this Friday will be forgiven . ” scholars say that only minor sins will be forgiven since major sins require repentance (taubah)

May Allah forgive all our sins.
Ameen

http://www.youtube.com/watch?v=vKripHEAab8