Honda GX360 Owner's Manual page 34

SERVICING YOUR HONDA ENGINE
4. Clean the air filter elements if they are to be reused.
Paper filter element: Tap the filter element several times on a hard
surface to remove dirt, or blow compressed air [not exceeding 30 psi
(207kPa, 2.1 kgf/cm*)] through the filter element from the inside.
Never try to brush off dirt; brushing will force dirt into the fibers.
Replace the paper filter element if it is excessively dirty.
Foam filter element: Clean in warm soapy water, rinse, and allow to
dry thoroughly. Or clean in nonflammable solvent and allow to dry.
Dip the filter element in clean engine oil, then squeeze out all excess
oil. The engine will smoke when started if too much oil is left in the
foam.
5. Wipe dirt from the inside of the air cleaner base and cover, using a
moist rag. Be careful to prevent dirt from entering the air duct that
leads to the carburetor.
6. Place the foam filter element over the paper filter
element, and
reinstall the assembled air filter.
7. Install the air cleaner cover, and tighten the two cover wing nuts
securely.
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