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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.

Iron, or ferrous sulfate, is one of the fastest methods for killing moss. As such, you’ll find this ingredient in many lawn fertilizers and lawn killers. Vinegar is another solution for quickly killing moss. It takes just 15 to 20 minutes for vinegar to take effect. A harsher method is bleach, which also has a similar time frame for taking effect.

It can be dangerous to remove icicles from your roof, so the best option is to treat the underlying issue instead, usually by ensuring proper insulation in your home. If you’re concerned about immediate damage, you can hire a professional to remove the icicles and the snow accumulation on your home to prevent the issue from recurring. Just make sure you use a long-term solution, too, like addressing insulation problems or installing roof heating coils on your roof.

While DIY cleaning is feasible, it's risky without proper equipment or experience. Hiring professionals ensures safety and effectively avoids damage.