I've never seen a suspended grid with sheet rock attached to it.
I do as many have said with the sticks etc. What I use in suspended ceiling I have a wood closet rod about 5 inches long that I wrap my string around. I just pull off what string I need and put a half hitch around the rest, I can throw it pretty far, if I have the room. My sticks are the fiber glass rods for cleaning chimneys and they work well and if I have the room I have some old Telco lay-up sticks that beat anything else.
