Meritline offers this Electronics Cleaning Putty for $2.99 with free shipping. That's the lowest total price we've seen for any cleaning putty by $4. This ecto-plasm-like goop is pressed into dirty electronics (like a keyboard) and takes any dirt with it when it's peeled off.

It seems a lot like Silly Putty, but way, way less silly. Somber Putty.