The uniformed cleaning techs at Crystal Clear hue to a written guarantee of satisfaction and never leave a site until a customer approves the results. Fully insured, Crystal Clear runs background checks on all techs, who identify themselves by name to both customers and grateful, begrimed windows. Customers receive a detailed invoice of the requested services before the cleaning commences. Under Crystal Clear?s flat-rate pricing, this Groupon will uncover the sheen for approximately six standard-size windows. To ensure house eyes escape from unwanted grey shields, Crystal Clear techs never use diluted or make-believe cleaning solutions.