You really need to clean them regularly to avoid the belt getting damaged by grit/sand.
The later Centertrack reduce this compare to the earlier generations.
I have heard the same about centertrack.
And when you do need to clean grit out you just use a toothbrush and maybe some water or whatever. No degreaser or ultrasonic bath.
@Belagerent started
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The later Centertrack reduce this compare to the earlier generations.