There is no set amount required per regulations. Cleaning of the aircraft is entirely up to the operator, but if an aircraft operates in corrosive conditions they will typically be washed more to help lengthen the life of the aircraft.
yes
Prop wash is caused by the turbulent airflow produced by rotating aircraft propellers. This airflow can create disturbances in the air that can affect an aircraft's performance, especially during takeoff and landing. Prop wash can also create challenges for ground handling personnel and other aircraft in the vicinity due to the strong airflow and turbulence it generates.
High pressure wash equipment
The usual term for that is prop wash.
High Pressure Wash Equipment
Models wash their hair often, depending on the work they do.
Do not wash... They absorb water...
Not often enough.
Cats wash themselves very often. A Cheetah would definitely was after a kill or after eating.
Women should wash their hair at least every two days. But I wash my hair everyday.
It is recommended to wash a towel used for bathing after every use...
How often you should wash your hair in a cold climate depends on your hair's natural greasiness and how comfortable you are with it. You should wash it whenever you feel like it is too greasy.