I've searched high and low for cleaning tips for a specific situation I have. I've only had my black nylon Prada Vela shopper tote for about a year, and the lower half of the bag has many light grey marks. They look like either scuffs or set in dirt. I really do not recall any single instance of the bag getting dirty, though I do use it for travel and in inclement weather instead of my leather bags. I've seen elsewhere on the forum that Prada nylon bags are known for being durable and tough - so I'm wondering now if the bag is a fake. I bought it on Gilt. Here's what I've tried so far 1) warm lightly soapy water with soft bristled tooth brush 2) alcohol wipes 3) eye makeup remover. The bag looks like it gets clean, but then once it fully dries the marks are still there. I'm a bit baffled seeing as some on here have their nylon bags for years and years and they still look great. After spending ~$1k, I really do not want to have to trash this bag! PLEASE HELP!