How do you clean inside your low whistle? I have a Dixon (plastic body)and an Overton low D (alu body), both no-tunable.
Thanks,
hi stefpat,
i always put a few drops of washing-up liquid in the mouthpiece.
i also use a cleaning rod.
edit: if your mouthpiece is clogged up, it’s best to soak it in warm water.
http://www.stentor-music.com/catalogue/html%20general/86.htm make sure the rod is long enough
i haven’t got an overton, but colin told me to cut up my visa card and scrape the whistle out with it.
this is also a good cure for WHOA, you can’t buy anymore whistles then. 
For all plastic or metal whistles, you can do pretty much whatever you want. Ive even heard of some people putting them in the dishwasher, although that seems a bit extreme and might warp the blade of a plastic whistle.