If the layout of your roof requires you to climb onto it, do so when it's dry out to reduce the risk of slipping. [substeps] Of course, once you start washing your roof, it will get wet and pose a risk.
[header] How to clean a metal roof [title] Wait for dry weather and overcast skies. [step] Avoid cleaning your roof in direct sunlight. Keep in mind that metal and light-colored paint will reflect sunlight and create glare, which may drastically reduce your vision.