Front brakes after mud?

G'Day all,
Has anyone had the same problem as me that after going through a nice bit of thick mud,the front rotors get all cloged up with little stones & grit? It really sounds & feels horrible!!
I took a look the first time it happened & saw that the meatl "bit" covering the rotors is like a massive scoop for mud??
Please educate me lads.

Much appreciated,

Macca.