Fuel Cap Breather

[fazersharp]

I know there's a hole that goes from the top of the tank to the bottom vent underneath, but was wondering if there was anything in the cap at all that could need a clean.
To be honest it doesn't really matter now, i just found a shiny brand new one for £20 so thought i'd tart the bike up a bit as the old one looks so grubby.
It'll mean another key but i'm not really bothered about that. 

Now i do like shiny - but what is so bad about the old one, wont it clean up