We "dip " our cookies
Powered Sugar
Vanilla
Hot water
Not all had issues
TY 
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Hi, Koko, Congrats on making your first post. I look forward to many more to come!
Hi, @Koko, yes, this is the right spot for this post. Usually, humid drying conditions lead to spotty results. (Some say butter bleeds into the icing and also spots it, though I've never had that trouble.) Have you tried drying in front of a heat fan to accelerate drying? Or perhaps try royal icing - the added egg white in it causes the icing to set and dry faster. Best of luck.
Hi @Koko
In the past, I practically always had these stains with a simple powdered sugar-water mixture, just not as badly. They came gradually and slowly got stronger. That's why I strongly assume, as Julia said, that the fat in the butter will destroy the cookie glaze. If you want to stick to a sugar-water mixture, it might be worth trying to glaze the cookies with raw egg white (unbeaten) before baking. The cookies then also shine slightly. Maybe the baked egg white doesn't let the fat through? I could imagine it anyway and I will try it once! Hope it helps?