For cleaning sensors, I've used all sorts of stuff with no bad results. The best I've found are the sponge-type makeup applicators that you find in compact makeup cases. You can buy these by the hundred or so from drugstores, beauty suppliers and probably even Amazon. They don't have fibers to shed and they don't disintegrate when pure alcohol is used on them (the ones I've used haven't at least.)
Also, the best cleaner I've used aside from those are a good old rocket blower.