I do need to wash mines once a few days with lookwarm water and mild dish detergent as nothing other cleans them so good! FYI I did try all the other things, too-spray, wet wipes, and special cloth---it seemy my specs get rather oily (in small patches) from creams, hair spray, make-up or cooking-who knows. It's the cloth you are wipping them after the wash that matters more I think -so don't use scratchy or prebalmed(!!) paper towels! I use the special cloth for specs for this. But it happened to me to ruin my coatings in the past (I always have those against sun and blue light) when I washed them 1.too often 2. in hot water and 3. probably scratched them with paper towels of all kinds...so be aware of that!