How often is the exterior of airliners cleaned?
According to Lufthansa Technik, with the new cleaning agents, once every 6 months.


  Until just a few years ago, wide-bodied aircraft had to be washed four times a year with foam and up to 13,000 liters of water. Today, thanks to newer cleaning agents, a resource-friendly dry wash every six months is enough.


It takes between 8 and 24 hours to wash or dry wash an airliner.