I was getting my haircut yesterday and the barber told me that 10years ago he had a large dent in the front mudguard. Someone had kicked it when it was parked. The pdr guy that came out put magnets on the inside of the guard and worked the outside and removed the dent perfectly.
It is the first time I have spoken to someone who has seen that. I have not been able to find any genuine information on removing dents using magnets.
It is very interesting. Hope I can find some more info one day.