See
Figure 1. The engine air cleaner is a paper/wire mesh air filter element.
The paper/wire mesh air filter element should be washed in luke warm water with a mild detergent.
WARNING
Compressed air can pierce the skin and flying debris from compressed air could cause serious eye injury. Wear safety glasses when working with compressed air. Never use your hand to check for air leaks or to determine air flow rates. (00061a)
Allow filter to either air dry or blow it dry, from the inside, with low pressure air.
Do not use an air cleaner filter oil on the Harley-Davidson paper/wire mesh air filter element.
NOTICE
Install air filter before running engine. Failure to do so can draw debris into the engine and could result in engine damage. (00207a)
Figure 1. Air Cleaner Assembly: Sportster Models