To remove a towel bar with a set screw, loosen the screw until the first end post comes off, then repeat for the second post. If your metal towel holder has no set screws, search for a metal tab keeping the end post in place. Press this down with a screwdriver to release the end post. Repeat for the second post.
How do you remove a porcelain towel rack from drywall?
Tape the wall around the base of each ceramic towel bar post. Use an oscillating multi-tool to cut through the adhesive between the wall and the towel bar holders. If absolutely necessary use a hammer along with a chisel or pry bar to pop the towel bar holders from the wall.
