Humming bird feeders -- hygeine

I've always thought the "replace every day" dictum was a bit much, but I 
took all three down and scrubbed them a while ago, and I must confess 
that however long it has been it was way too long.

I first filled them when it was still quite cold (worried about them 
freezing several nights), but it is clear that when it starts to warm 
up, I need to tend to them more often.

But I can't afford 8 pounds of sugar a day!  (I've got 8-cups water, 
2-cups cooling--we'll see how that goes.)

By the way--the other day there was mention of heating the water--I 
don't do that to sterilize as much as to make the sugar dissolve better.
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