We like to keep schedule on all  our window cleans, But Sometime the weather makes its hard to do so.. Yes we can clean windows in light rain as rain water is pure. But in heavy rain conditions we move the clean. Not only does it save me getting Wet. Some customers dislike it, so If your Windows is Due and we have contact you will ( sorry due to weather conditions we cancelled this window clean ) we normal get your done as soon as the bad weather passed.