There were some tissues, wipes, napkins lying around on our concrete floor near garage for maybe few weeks/months so when we decided to pick them up, they were stuck on the floor like a sticker and we had to literally use force to unstick them and take them off the floor. Is it common for cloth, tissues, napkins or plastic to stick to concrete floor if left on the floor for ages? Does that mean our concrete floor is porous or is it due to the moisture, rain, etc? We noticed this happening few times before too. Please advise the logic. Thanks