How to clean mysterious white marks from laminate flooring?
We had Swiss Krono laminate flooring installed at the beginning of the summer. We had half a box of planks leftover which we stored under the bar in the dining room for about 6 months. Just moved the box and found this white mark underneith. It does not wash off. I tried a bit of rubbing alcohol but it doesn't budge either. There is no water in our dining room but we do live in a climate of high humidity. The only thing I can imagine is that moisture from the humid summer somehow left this mark under the box but I don't really know. It's not hardwood so the tricks for removing water spots from hardwood won't work. Thanks for any suggestions!