Be gentle, but let them know that they are harming and possibly killing the hummingbirds that feed there. The usual response I get is, "It's only sugar water, what harm could it do?" The answer to that question is - "Plenty."
There are many websites with information on feeding hummingbirds. The following quote is from wildbirdshop.com:
Sugar water is a very rich growth medium. Yeasts like to eat it causing fermentation which can harm hummingbirds. Mold and bacteria grow in it and can also harm the birds. That is why it is important to keep the feeder clean and the nectar fresh. You must change the nectar frequently to avoid these contaminants. In cooler temperatures we recommend changing it every seven days. If the temperatures are getting above 70 degrees, follow this chart:
High temperatures
Change nectar after 71-75
6 days 76-80
5 days 81-84
4 days 85-88
3 days 89-92
2 days 93+
change daily
Here's another from audobon.org:
Cleaning Feeders: Change the sugar solution often. Clean and put only enough fresh sugar solution in your feeders to last one to two days in warm weather, or sooner if it looks cloudy or develops mold. Keeping feeders in the shade slows down fermentation and mold growth. But, feeders placed in the sun are more easily seen and seem to attract more individual hummingbirds.Use only vinegar and water to clean feeders. Soap or bleach traces left in feeders, even after thorough rinsing, can harm hummers. A specially designed sponge or brush can help. If you use bleach as a last resort, follow-up by cleaning the bleach out with a vinegar and water solution.
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There is another, and in my opinion better, option: Plant the plants that attract and feed hummingbirds. There are many. My favorite is called 'Batface', more formally - Cuphea Ignea, which has long thin red flowers. There are also many websites with information on the plants that hummingbirds like. Here's one I like.
Here are a few pictures of hummingbirds feeding in my garden:
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