I have had this feeder for years now and, in my opinion, it is by far the best feeder.  I love that it has a little circular bar for the hummingbirds to rest.  I don't know if they really need this but I like it as it also gives me a chance to look at them when they are fairly still.  I just watched the two videos that are here on this Amazon page and have to say that they have some good ideas on cleaning with vinegar and rice.  The bottle is difficult to clean but I take the time needed as I do not want to cause a hummer to get sick due to my neglect.  What they don't show in the video is to clean the flowers.  I pop them off and clean them very well with an old tooth brush as black mold can hide here.  I also clean the bottom holder very well.  I put a sturdy paper towel in there with hot soapy water and then use a slender nut pick to move it around and get everything clean.  I hope that you will enjoy this feeder as much as I do.