How do I remove dirt and mudd from my shoes to produce them look latest? They are already kind of dirty (hardly noticable) but in recent times...

They are already kind of dirty (hardly noticable) but in recent times today I stepped in some mudd and immediately the dirtyness is extremly noticable, I already tried wiping some rotten with snow while I be walking so it didn't dry and harden on my shoes. Now I hold dirty streak marks and I a moment ago want to get rid of them, so my shoes look close to new, or at least possible whiter than before.
Answers:    Mr Cleans Magic eraser does it for me. That article gets any stain past its sell-by date seems resembling.
Put them in the wash machine. No seriously, it does work!