Even airplane-like planes during landings and landings get dusty and need to be cleaned after a while.
Depending on the size of the plane and its movements, a large plane is washed once every 6 or 8 weeks.
This however depends on the company policies and is not mandatory.
Washing a large plane can take up to 8 hours, and special detergent was used to wash it, as well as large brushes built to wash the planes.
Companies do not show how much they pay for washing an airplane, but looking at some online pricing, the price for exterior washing of a large two-engine airplane is about $ 600, polishing $ 2,500, and interior cleaning about $ 350.