Hi I have a hive top feeder. The wooden kind. They are used and dirty. I cleaned them up. I soaked them on bleach water. But they are still dirty. I cant tell if it is mold. The varnish has split and it is down inside the cracks. I have bees coming Sunday. Can I revarnish these to keep the mold or dirt away from the syrup I am feeding the bees? I have removed the screens and am replacing them with new. What suggestions do you all have. I am new and these are my first bees. BU