As it is not mentioned, I will add it to the items that can be used to remove particulate from a Styli.
The product is Jewellers Putty, used to pick practical of Gem Stones.
Making a Match Type tool using a Tooth Pick will allow for it to be used as a probe, or a small ball to lower the Styli onto are both OK methods.
If a TA has a Cue Lift Lever, and the Volume is not turned down, the Styli can be lowered to just above the Groove, prior to it making full contact, this will show immediately if a particulate is present that will effect the sound to be produced.
If all is quiet above the Groove 99% of the replays will be quiet when making first contact with the Groove.
The isn't too many options to use as a safeguard to particulate collecting at the styli throughout the replay.