First off, having my own septic system rather than being on a sewer system, I don't want fats and oils down there at all---even if mixed with soap. The emulsified oil still has to go somewhere.
I use large recycled plastic jars as my waste-oil containers (letting the oil cool first, of course). Once full, the whole thing just goes in the trash.
or the birds will swell up and...uggh - it won't be pretty.
DC, I'd pay ten bucks to see that!
Seriously, this is one of the biggest modern myths to ever take off. Probably started by big-city sanitation people who didn't want to sweep up all that rice after a wedding.
Think it through. In the wild, birds devour dry grain. They're eating seed heads, and any domestic grain available. And if you buy commercial bird feed all it's made of is assorted raw seeds.
It would be contrasurvival for dry, raw seeds to have a negative effect on them.
It's just incredible to me the numbers of people who've bought into this idea.