Hi everyone. I run a restaurant with a big storefront on a busy avenue and the windows are our first impression. Between traffic film, fingerprints and whatever the sidewalk throws at them, they look tired within a week of being done. Right now a guy comes by with a bucket whenever he remembers. I would like something scheduled and reliable instead of that. What is a realistic frequency for a street level storefront in the city, roughly what should it cost per visit, and will anyone work around service hours?