Rusty fuel filler cap

[mjmicra]

Hey guys
I have rust around the inside of my fuel filler cap, also its rusty and corroded around the inside where the nozzle goes to fill up, has anyone else got this, is it a common thing?
Was thinking of wire wooling it, just gotta be careful not to let anything drop into fuel tank

 

[Mr Grey SX]

yes i have that problem too. was thinking of stuffin hole with a rag, rubbing it down then hoovering out the filings.