Slippery bar clamps? Not anymore, thanks to this quick fix solution.
Clamp handles, Getting a better grip

Many of the clamps I use, particularly bar clamps, have wooden or plastic handles that seem slick, especially for dry hands. To give the handle some "tooth" for gripping, I wrap self-sticking anti-skid stair tread tape around the handle. (You can find it at most home centers.) One roll of this gritty stuff lets you get a grip on a lot of handles.

— Dennis Peterson, Lewiston, Idaho