As always, people should do their due diligence and do a little research to learn how to properly use and care for a hummingbird feeder before taking on the task. I've been using them since I've lived here, about fourteen years. I started by boiling the water but now I only boil part of the water to dissolve the sugar then add regular filtered water from the faucet for the remainder.
In the heat of the summer here in hot Texas, the feeders do need regular washing. When it's hot, I wash them every time I fill them and that's usually every day (since there are probably a hundred of them flying around by then). For right now in the cooler temps, I will leave the nectar for about four days or so and then make new.
Here's an article I wrote awhile back. I still do it pretty much the same:
https://garden.org/ideas/view/...
