Do you have dents on your Logan?
I do!
I park mine in heavily populated area, where we "fight" for each parking spot, so, cars are parked very tight and when someone opens the door to enter his car - it is very likely that it will make a dent on your car Logan (and Renaults in general) seems to have very thin metal that is very prone to dents...
But, have a look at this link:
http://www.youtube.com/results?search_query=removing+dents