What's the best and most environmentally friendly way to dispose of used cooking oil?

Make a bird feeder - mix with stale cereal, oats, muslie etc


maybe even flour in winter (a little), mix with dried fruit, nuts and seeds - push in to a container and string up for the birds to enjoy.


or


flush it away with a good washing up liquid this will break up the fats so they don't become clogged in the cystem.What's the best and most environmentally friendly way to dispose of used cooking oil?
Find someone who uses it in their car and give it to them.

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