Needed: Good references on cleaning systems and cartridges

[Matt-El]

I'm going to be doing a speech on cleaning Nes cartridges and systems in college ( :) ) . I need visual reference (one or two pictures) and links to a couple of sites and possibly a reference for people to get cleaning kits. General Video game Cleaning reference is okay. Also, this may give people here who don't know about this stuff a hint or two.

I'll do searching of my own, but if anyone wants to help, feel free. Thanks.