Whatever works... those pins are in there, or better be, good and tight and it's unlikely that you can disturb them! I use the regular small brush attachment on my vacuum cleaner when I get annoyed enough at it. If the dust is sticky (it may well be, particularly in a city) you can also try something like a cotton swap ("Q-Tip") for really tight spaces, or something like a slightly damp piece of cloth twisted around a pencil...
Innovate!