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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.

One upside of tile roofs is that clay, concrete, and slate tiles require fewer repairs and less care than most other roofing options and are considered low-maintenance materials. Aside from as-needed repairs, annual inspections, and routine gutter cleaning, your tile roof won’t demand any maintenance and can provide 50 to 100 years or more of worry-free protection for your home.

Vinegar, bleach, chlorine, barley straw, and a bevy of dedicated algaecides can kill algae, which is the easy part. Preventing algae from returning can be a struggle for some homeowners, but keeping the patio well-maintained and clean is a good first step.

In most cases, it’s a good idea to leave the icicles on your roof and wait for the warmer weather to melt them away naturally. You should only remove icicles if you believe they’re heavy enough to cause damage to your home or anyone who enters it.