They will get just as dirty as your windows in your house, no more, no less. Cleaning twice a year is usually sufficient. Don't fall for the fixed screens as you will have to have someone lift out your sliding glass to clean it and put it back in place. If you have sliding screens and doors they are easy to clean. Give All Seasons Rooms a try, Chip offers a window with a lifetime transferrable warranty that the others don't offer.
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