I make my own pot scrubbers for free from plastic mesh bags used to hold produce like oranges or onions. There are lots of ways to do this; you could just roll the bag up into a doughnut shape and tie it, but here is how I crochet them. If you don't have a mesh bag, tulle fabric also works well.
Cut the bag in a spiral into a strip about 1.5 inches wide, avoiding labels and large holes. If you have more than one strip, they can be joined with a slit joint.
Chain 6, join to make ring. [This leaves a hole in the center; I am thinking of doing ch 4 here next time.]
Chain 4, then make triple crochet stitches into the ring until you are about to run out of bag, or until the scrubber is a full enough circle to suit you. Join the last stitch to the top of the ch 4, tie off, work in the end. That's it!