are they asking for this to be done on a weekly basis or is that your idea? we have people who ask for it just once a month, others ask once a week etc. from experience i'd say computer screens once a week at most if it's just removing dust and not finger prints, then maybe once a month for finger prints, and keyboards once a month too, though it depends who quickly they get dirty and what level of cleaning is expected, e.g. if it's just a dust of keyboards then this can be done same time as the screens but if to get in between gaps to get a sensible amount of the crumbs out and washing the ones with coffee on them then this'll take a lot longer