We are having new blacks installed this summer, and the shop that is fabricating and hanging the curtains emphasizes that it is best to remove dust by vacuuming the fabric once or twice a year.
There was a fire in one of the other high schools in our district that raised the same issue. The curtains that went up were properly flame proofed, but the accumulated dust was not.
My Director recalls having a contractor (a young, self-employed man) clean the curtains on the college stage where she worked many years ago.
He stood on the stage floor and used extension tubes to vacuum the curtains all the way up.
We would like to buy appropriate equipment so the custodial staff at the high school (or possibly the stage crew) can conduct regular cleaning of the curtains in place.
While I could certainly fabricate something out of lightweight plastic tubing, my first choice would be to locate commercially sold equipment intended for the purpose.
Does anyone have any relevant experience with this?