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That's why mine is still in the garage ,, and it's a fairly new piece that they kept clean at the academy for training purposes , but it's still been dragged around and sat with dust on it for years,...

I was told many moons ago that it might just gave way too many impurities to chance it, my son got me a hose, !( lots of fireman paramedics in the family) so I still have it and haven't done anything...