what i usually do is hand-brush all the dirt and move all these "foreign particles" into the bottom of the rails. then from the rails, brush it going to the pockets. then i vacuum the rails and the pockets.
I use a Rhomba
Brushes not too strong
It learns the size of the area and shuts off when done.
NightLife
Problem with brushing is it embeds as much chalk dust into the cloth as it removes from it. Brushing is good in a pinch for a once in a while quick clean if you have to, but its not good to do regularly.
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I will add, fwiw, no one will ever use kamui chalk or any other new formula chalk that is pasty. That material is triple hard to remove from cloth.
best,
brian kc
I use a Rhomba
Brushes not too strong
It learns the size of the area and shuts off when done.
NightLife
I use the Dyson hand held. Quite a bit of suction for a small unit and it is easily stored out of the way.