Cleaning out the refrigerator is no fun. Especially, if there tends to be a bunch of containers. Containing old, stinky leftovers.
I like to toss the containers in the freezer for several minutes to a half hour. Sometimes overnight.
The leftovers freeze into ” leftover-sicles”. Which (after thawing on the counter for a few minutes) releases cleanly from the container.
No need to dirty a spatula. Or, stink up the kitchen.
Just be sure to take out the garbage, before everything melts.