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After reading the posts, I'll be the antagonist. "At the left over Christmas goods boxes, the allergy medicine aisle, clearning (sic) stuff aisles, rest rooms of any public buildings, I can feel." ...

"I feel these flying bugs at stores, markets and restaurants". And therein lies the answer.

The spots most likely are water and chemical damage to the floor and trim finish. The "white shapes" in the photos are pieces of recycled polyurethane and would be expected. From my past chemical...