We also have the pre-engineered wood floors. Our house is nearly 4 years old (next month). Our cleaning lady has used a damp mop all this time and it is beginning to cause a problem. Seams that were invisible when new are obvious now. The water is causing a problem. She has always insisted this was the proper way to clean them; however, the installer said no water. When she comes this Friday, she will be forbidden to use water ever again. I can see some very slight lifting. I have a swifter with wood cleaner and I always make sure there is no heavy concentration of damp on the floors when I clean between her visits. I would be very careful of vinegar/water solution based on my 4 year old floors. We have no dogs, three cats and only my husband and I live in the house. The wood floors are in the foyer, living room, dining room, hall to half bath, family room, breakfast area and butler pantry.