“I know a old lady who swallowed a fly…”
I used to fight to get my PB jars clean enough to recycle, but a while ago I consciously decided that it is not worth the battle. Ain’t nobody got time for that.
So now I just toss them into the regular trash (where, I believe, most of my recycle material ends up anyway).
I guess I’ll never make Saint Mustard.
mmm
That’s what I came here to say! It keeps them busy and quiet for a while and I get a clean PB jar.
It is, and believe it or not, the term is “Cleaning Processes” 
I used to keep a length of light brass lamp chain for cleaning out bottles for brewing and winemaking - it’s easier to control than beads
Not to buzz kill the dogs joy, but…I can see one of daughters Chihuahuas with a jar stuck on their heads.
Yeah, shaking it works. But just recap the peanut butter jar and toss. You use far more energy and resources trying to clean it, and there is a reasonable chance it will go to landfill anyway.
You were right. But be sure to recap, since critters will get their faces stuck in the jar if you dont.
Unless you have a dog 
… but make sure there is adult supervision.
Sunset.
My way of getting peanut butter out is to never eat peanut butter.
If you tossed my mom’s dog a used peanut butter jar, then ten minutes later, there wouldn’t be any peanut butter left… but there also wouldn’t be any jar left.
I like that. 
I guess a small dog would have issues. Mine - Great Dane, German Shepherd, and Boxer have the problem of not being able to fit their noses all the way in to get to the bottom!
You people are way too energetic. I just throw the damned jar away, PB and all. My failure to recycle a small plastic jar every six months or so likely won’t kill the planet.
Galactic News Today
The death of an insignificant minor planet on the outer rim has been attributed to the failure of one of the residents to properly recycle peanut butter jars. What exactly those are remains a mystery.
Right, and my recycle people even say to not bother with more than a quick rinse.