- 1). Insert the tip of a flathead screwdriver between the paver stones. Dig the moss out of the cracks with the screwdriver.
- 2). Scrub between the cracks with a stiff-bristled brush to remove any remain bits of moss. Sweep up the removed moss with a broom and dustpan.
- 3). Pour 1 gallon warm water into a bucket. Add 1/2 cup of ammonia.
- 4). Dip a scrub brush into the diluted ammonia solution. Scrub the surface of the paver stones to kill and remove algae stains. Rinse the scrub brush as the algae is removed. Apply more diluted ammonia and continue to scrub the pavers.
- 5). Rinse the paver stones with water from a garden hose. Allow the surface to air-dry completely.
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