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Cleaning apparatus:
– Electric agricultural sprayer system developed in Florida in the early 1990s
– Soft washing process with a cleaning solution containing bleach
– Pressure washers can damage roofs if used at more than 100 PSI
– Asphalt Roofing Manufacturers Association recommends bleach solution without pressure washer
– Specialized robots designed for roof cleaning

See also:
– Domestic roof construction
– Roofer

References:
– Alan J. Brook’s research on roof discoloration by algae
– Effects of soiling and cleaning on roofing membrane reflectance
– Comparison of sodium hypochlorite, sodium percarbonate, and sodium hydroxide for roof cleaning
– Asphalt Roofing Manufacturers Association resources on algae and moss prevention
– Innovative service robots for facade cleaning in hard-to-reach areas

Additional resources:
– Fox59 article on roof cleaning cost
– RenewEconomy article on the future of car ownership
– Google Books reference on airborne radioactive contamination
– eClean Magazine article on roof cleaning chemicals
– IEEE/RSJ International Conference paper on service robot systems for cleaning