I am accustomed to loosing many of my tools and such, so the idea occurred to me why not make a laptop Ultra Portable Microfiber Screen Cleaner that fits in to my pc card slot. This idea could be applied to any pc card slot on any laptop this just happened to be what was in my laptop (hp DV6000).
Cardboard (in my case thin cardboard from cereal box worked good, it will depend on your pc card)
Needle (for the thread)
Step 1: Find Your Type of Pc Card
Find your type of pc card or find the current card inside. This remote (that I never use) was in my card slot so I used it for the next step.
Step 2: Trim Thin Cardboard to Size
Now just use the card as a stencil for both the thin cardboard and microfiber sheet.
Step 3: Stick Microfiber and Cardboard Together.
I did not bother using glue (not a bad idea) I just took the time to use thread. You will probably need to use thread, that should press hard on the edges, this should make sure bits don't fall in to your laptop. If you have skills then it may be good to try hemming the cloth, unfortunately I lack those skills.
Step 4: Make a Loop, Done!
Find a way to make a loop or tab so you can pull it out of the slot and that's all folks!