I still use soap and water. It's cheaper than solvents, has worked for centuries and will work for centuries after we're gone.
On urinating down a barrel, that was only a battlefield expedient by soldiers to clear the fouling so the gun could be reloaded. It wasn't done in the barracks or on the range.
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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