Just adding on what FCVAN said i think youll find that the mud getting flicked up off the tyre's once stuck in those area's hold's the moisture and then you get the huge amounts of rust that you see.
When i did mine recently i had piles and piles! of dirt coming out of all the thing (i should have put in jars and sold as NOS dirt! ;D ;D)
REGARDS
MIchael
8) 8) 8)
When i did mine recently i had piles and piles! of dirt coming out of all the thing (i should have put in jars and sold as NOS dirt! ;D ;D)
REGARDS
MIchael
8) 8) 8)