Gunbei, I leave the dust and don't even try to read the displays, rather using my ears than my eyes to voice the music. However, when the dust has collected so much, that I cannot find anymore knobs to twiddle, I feed my subwoofers with LPs like "the Darkside of the Moon" or "Also sprach Zarathustra's" opening bars and the dust gets blown from the listening area in great rythmic swirls. This happens every five years or so and is very effectful, in that it gets the neighbours wondering, where the sandstorm and the thunder came from. Very amusing and highly recommended. But you definitely have to anally sit out that period of at least five years and let the dust collect without interfering.