Having your windows cleaned on a regular basis is important for a number of different reasons. One reason is that it's important for your health since mold is known to develop very quickly along the edges of windows where warm and moist air collide to make condensation. Another reason is that mold buildup around the edges of your window can cause the caulking to wear down and can eventually erode the seal entirely. Taking precautionary steps like having your windows cleaned regularly can go a long way toward keeping your windows in good order. Some contractors will offer window cleaning as an addition to another type of service they provide, but this isn't guaranteed. If you don't want to get window cleaning as part of a package with other services, you should ask about window cleaning specifically when you contact potential contractors. You should contact various contractors to see what they offer and what their rates look like. When you get a good idea of the rates offered by a contractor, you will be able to narrow down your options a lot faster. Since there are a lot of contractors out there offering these types of services, anything you can do to make the decision go by faster is a good thing.