The two main methods for roof cleaning are.
How to soft wash a tile roof.
If you are to step directly on the tiles place.
The surfactants used for soft wash cleaning seep into the nooks and crannies of a roof and soften and dissolve thick dirt mud sand and even storm debris.
By comparison a fire hose sprays at 150 to 300 psi.
Spray the roof with plain water to dislodge loose dirt and debris.
Pressure washing in which highly pressurized water is sprayed on the roof to remove any mold algae dirt or grime and chemical cleaning sometimes called soft washing in which chemicals are the main thing that are removing those harmful things from your roof.
See coverage area to the right to determine how many gallons of solution you ll need.
Shoes with good traction will give you additional hold and balance while.
A low pressure washing rinses everything away reducing the risk of damage to shingles and tiles and other materials.
Instead soft washing with a garden hose is least likely to chip dent or crack the tiles or panels.
Cover and avoid all windows when spraying.
All these terms mean is a sensible use of pressure to rinse the roof without damaging the shingles or roof tiles.
High volume low pressure rinse roof shampoo and others.
Wet mossy and soapy tiles are slippery.
Doing this ensures that debris is always heading in the right direction off your roof.
Start at the ridge of your roof the top and spray down toward the gutters.
Step on the lower portion of the tiles.
Wash safe roof wash is a strong concentrate.
Using a balanced method of lower pressure 45 psi proper products and allowing cleaning solution the time it needs to clean soft washing eliminates the problem instead of merely spraying at damagingly high pressures for an initial surface fix.
Use shoes with good traction.
Important safety guidelines to follow when cleaning tile roof.
Add 1 2 cup powder per gallon of warm to hot water.
The average garden hose sprays water at 40 to 80 psi.
So to answer your question.