I have to throw my cent-&-a-half's worth into the discussion on
vacuuming tracker bars. A good item for this is one I use.
Take a rubber crutch tip that fits over the end of the standard vacuum
hose. With an X-acto knife cut a small rectangular hole, (about .250 X
.375) in the end, and you have a nice tool that covers about three holes
at a time, concentrating the pull on just a couple of holes. Also,
being rubber, it seals, and doesn't scratch or mar the tracker bar.
If you want, you can take a piece of fairly porous cloth, and put it
on between the hose and the tip, to see what you have pulled out of