I just want you honest opinion on this as I have taken a conservative approach to this. I don't know enough to be confidant I did the right thing. we did a group ride last night and part of that ride included the bushfire zone from last month in Adelaide. we regrouped in middle of Kersbrook and a farmer truck passed us by. I knew that we had 10kms of double white lines. sure enough we took off and farmer joe loomed up soon ahead of us. he decided to put half the track into the dirt and the other half still on the road so he tried to do the best thing with 30 bikes behind him. only thing was we had a howling wind happening and we, over several minute got dumped with sand and grit behind this truck. I only had one thing in my mind.......I will need to get the scrubbing brush, and kero to clean our chains asap. I did that today and wash and polished our bikes. 3 hours all up. but they are relubricated with Motul (looks white when applied) was this over reacting or the dust wouldn't have done any damage to the chains and cogs. remembering we are cruiser riders and if a fly shit land on our bikes......we panic.