My guess is that the " Australian dust" arose from inside your petrol tank rather than the external atmosphere; unless, of course, your ride was to Birdsville. On most Australian roads you will not get enough crap in the air to make any difference- particularly if your machine spends most of its time in a "bubble"; whatever that is! I would drain your petrol tank through a fine mesh if I were you, if you find nothing amiss,change your petrol station. Also, cheap in-line fuel filters are a better investment than Vokes cleaners if you are actually using the machine. Bits of abrasive grit left behind after a "RESTORATION" will do a lot more harm than using the jigger as it was intended.