Do not use a detergent to wash feeders. It leaves an oily film. Use bottle brushes and pipe cleaners to get at hard to reach places. Before storing feeders for the winter, scrub them out with a mild chlorine bleach solution. This kills bacteria and traces of the chlorine will be gone in a few days.
Some folks make their own feeders.
A small pill bottle works well. Cut a soda straw-size hole in the top and decorate the bottle with a plastic flower or bit of red cloth. Use a wire to hang it from a branch where it will have some shade and be protected from wind. Fill the feeder with a sugar syrup. A quarter-cup of sugar to one cup of water is a good formula.