The particles forming ashes and dusty products are generally agglutinated, joint together by cohesion forces.

If any carrier of mechanical energy reached these particle conglomerates, an energy higher than the cohesion force that holds them united, that bond would break and the particles would be freed.

A sound wave can carry that said energy on a very high-pressure peak condensed in an instant.

SAFEFON® acoustic cleaning units generate that type of wave from compressed air.