The CLENS lens protectors from Thyrm & Sage Instruments are like tear-offs for your helmet visor, only for your flashlight. They do the same job as smearing the lens with grease, only much less messily and for more money. Clean-up is as simple as peeling it off after your day at the range, leaving the lens no dirtier than it was 400 rounds ago.
Thyrm sent me these to try, but I'm gonna be ordering a couple more packs. That should be a many years' supply for school guns.
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