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Funnily enough I did exactly the same to one of mine the other day - I scrubbed mine out with a toothbrush using water & detergent. This gets rid of the white powder (bits of kerb & ally I expect). Now I need something to match the colour.
You need to get it covered quickly, the nailvarish is the same as clear laquer (provided that is clear as well). It just stops any crap from getting underneath the remaining laquer and causing more damage.