Can i clean the female insides of my powercables ?

This is a delicate procedure and can lead to your cable's inability to produce further electrons. It is also liability risk, so make sure you talk to your cable and explain the possible outcomes.

Try a pipe cleaner w/Caig on it. Watch that the fibers of the pipe cleaner don't let go. You can clean RCA's and female balanced connectors the same way.

I wonder if Dave Letterman is an audiophile? He'd probably be amused by this one. Classic comedic stuff here, but don't quit your day job!

If you don't have pipe cleaners handy and you're going to the store to track some down anyway, go to the dental care aisle at a drugstore and pick up some of the tiny brushes that are designed to clean between your teeth. They're built like a pipe cleaner but they're short and tapered from about a quarter inch wide down to a point, making them useful for a range of small cleaning jobs, and they won't leave fibers behind. They fit onto a plastic handle and the refills are cheap.

Only after a couple of drinks.....