Before taking pics of stuff you want to sell, (or just to clean your stuff) a blob of Blu-tac takes the grit and grime out of hard to clean places... Like rear sight assemblies, safety catches, magazine release, etc. Works well on all sorts of other gear too. I learned this trick in the army... the front and rear sights of an R4 (SA copy of Galil) can be a cast-iron illegitimate child to clean. Fiddly tritium tube night sight, and the inside of the AK type action and trigger mechanism... especially after assault course, when an inspection is looming!
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