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Originally Posted by voyager2
rain water on your corrector is no problem at all, rain water is pretty pure too so it shouldnt leave to much residue either, just leave it till the corrector needs cleaning, its really no worse than dew.
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not true, if you live in a built up town or city area or on the coast with salt spray as well, or an industrial area is nearby, the water will be slightly acidic, and also picks up dust and other contaminants in the atmosphere on the way down if it is at the beginning of rainfall after a dry spell. The acid will slightly etch the corrector coatings. Drying immediately with a hair dryer will help negate the piting problem. Lets just say experience and a bit of digging on the net in this area when it happened to me.
Dew forms close to the ground and hasn't had time to pick up the dust and other impurities, unless your in a really bad coastal or industrial area, or its carried by fog from said areas.