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On average, cleaning a roof will take between two to five hours. This timeline depends on the size and slope of your roof and the severity of any stains. Cleaning roof stains can take additional time, especially if there are signs of moss or algae.

In addition, the age of your roof makes an enormous difference in the time it takes to clean it, as older roofs need more gentle care. If you have significant landscaping in your yard by your house, your professional roof cleaner will need additional time to protect it from cleaning chemicals.

It may require stronger cleansers or chemicals, higher-pressure spray, or scrubbing to completely remove algae from a metal roof. Start with a mild cleanser; if that doesn’t work and you're comfortable doing so, use a stronger mix of ⅓ cup of laundry detergent, 1 quart of bleach, and 3 quarts of water to gently scrub the algae with a soft-bristled brush. If algae is present across large portions of your roof, doesn’t come off with gentle scrubbing and cleansers, or is in hard-to-reach areas, this may be a job better left to a pro.

To maintain a slate roof and prolong its lifespan, conduct regular inspections, ideally annually, or schedule professional inspections. Key maintenance includes cleaning gutters regularly, promptly replacing any broken or damaged tiles, and ensuring the flashing remains intact to prevent leaks. It is also recommended to remove overhanging tree branches and address minor issues as soon as they appear.

In most cases, it is best to leave icicles on your roof and allow them to melt naturally. You should only consider removing them if they are heavy enough to cause damage to your home or pose a risk to people below. Since removing icicles can be dangerous, it is recommended to hire a professional for the job if you have immediate concerns. To prevent the issue from recurring, you should address the underlying cause, such as improving your home's insulation or installing roof heating coils.