So this is one reason why you shouldn’t leave your window open in the Spring… 
(First of all, note how it chose to climb the one flute and stayed clear from the whistles to make its escape to the window.)
So, is anyone interested in a used Dixon low D flutehead???
If not, what is the best way to thoroughly clean one of these after being used as a chipmonk ladder?
I’d just play it. The worst that could happen is that your voice might go up three octaves and you’d enjoy international pop-star success. 
If you feel you must, soap and water will work just fine.
Wonderful picture.
Oh my gosh, that is so cute. I would have wanted to keep it.
I think it looks like the little guy is worrying about its embouchure.
I probably wouldn’t recommend it for you Dixon, but my wife has been running Yamaha recorders through our dishwasher with seemingly no adverse effects (she teaches kids).
You could swab the thing down with alcohol. I’d go for vodka, instead of rubbing, because the later leaves a foul taste.
Highland piper, I’m surprised you suggested vodka rather than blended whiskey (well, you wouldn’t waste a single malt). 
That’s because I wouldn’t have a blend in my house!
Hehheheheheh ()
My cheap numbers LUUURVE a hot tub with, what I call’ “Special herbs and spices”.
It’s my idea of “Kentucky-Fried” bath-salts - it’s called “Parmolive-Gold” - “Kind on your hands while you do the dishes.”
And those plasic babes just shine!! And all the pathogens they picked-up through being “played” and “passed around” don’t ever come back to me!!!
And if they are like the lichen-stars of whistledom!
And if the get PARTICULARLY gunked up by “Guinness” and its ilk - get the good old blue-and-white synthetic kitchen cloth, cut it in strips to fit the windway and floss! (the windway - till all the black stuf stops)
.. you can’t catch AIDS from a whustle - woohoo!
wow that’s a great picture; cute little guy. What brand whistle is the one all the way on the right? look like it’s made of boxwood…