Storefront Window Cleaning At Twenty20 Window Cleaning, we believe that the image of a business really says a lot about their quality. A clean and inviting image can determine the amount of customers your business will attract. Twenty20 Windows promises our 100% focus on making the exterior of your business inviting and beautiful. Storefronts aren't all we do, we will cater to practically any business. We realize that scheduling is an important concept for you and we are able to work around any schedule. We make ourselves available 7 days a week to be there whenever you need us.