What is this blue powder?






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What is this mysterious blue powder that keeps collecting on the inside of our window and sill?
I have the same problem. Do you have laminate flooring? My laminate flooring has blue foam on the underside of each plank, and I believe the powder is coming from this.
Not sure
I have just recently seen the same. Mine is blueish green powder form. Think it might be some pesticide, cleaned the whole area out so will see if it comes back.
We just discovered the exact same issue. I think it is from the back of laminate. We swept up a quart of it from under the dishwasher.