Oh heavens I wish I knew! In my apartment, I* have those awful popcorn ceilings. If you try to clean them, all that happens is the popcorn falls off onto your floors and furniture. I hope someone here can advise us both.
I was just visiting a neighbor with the same ceilings. Around her ceiling fans is, literally, a dark gray stain of dust. I could not tell her how to clean this. I know I have tried to but nothing seems to wor, plus it is VERY tiring to work on ceilings, with your arms raised above your head for any length of time.