You might try a mild mix of detergent and bleach and scub with a stiff
broom. The mix should be fairly well diluted with water (1/2 c. bleach and
1/2 c. soap to a 2 gallons water). Rinse it well with a pressure washer or
nozzle. Or go to your plant store and ask about stuff to remove moss from
roofs and lawns.
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