Use 433 tip to polish switch contacts (alcohol swab, polish and swab again method many pinsiders including Nic advocate for). Also great for cleaning inside of light sockets.
Disc steel brushes for cleaning male jones plugs - works like magic. These are also good for taking rust and corrosion off of any other parts too. Dremels have tons more uses - best tool I have for doing EM restore. Variable speed is recommended as some tasks best with high and others lower speed.