Honda ES6500 Owner's Manual page 35

3. Foam element: Clean in warm soapy water, rinse, and allow to dry
thoroughly. Or clean in nonflammable solvent and allow to dry. Dip
the element in clean engine oil and squeeze out all excess oil. The
engine will smoke during initial running if too much oil is left in the
foam.
4. Paper element: Tap the element several times on a hard surface to
remove excess dirt, or blow compressed air [not exceeding 207 kPa
(30 psi)] through the filter from the inside. Never try to brush off dirt;
brushing will force dirt into the fibers.
5. Reinstall the air cleaner elements and the cover.
6. Reinstall the top cover.
URETHANE ELEMENT
33