Man, that is some serious crud. I wonder if something like Vortex anti-fog lens cleaner might help in future. The ani-fog is supposed to last 7 days. Might be a decent release agent between the lens and crud. Another idea would be Rain-X. I’be chicken to try anything abrasive with that much grit until last resort.
“ When I comes to modern politics, I think the inverse of Hanlon's Razor applies...In other words, "Never attribute to stupidity that which is adequately explained by malice." - Kerplode
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