I’m thinking of giving my Clarke Celtic to a hobo.
I guess it depends on why you don’t like the whistle. If you don’t like it because it’s just not the whistle for you, sell it… perhaps the next person will love it. If you don’t like it because it has some defect, I suppose the right thing to do would be to give it away to some interested beginner (if it’s not going to impede them in some way) or toss it.
I’ve rode freight trains across the country and up and down the west coast.
Give it to me, seriously.
Usually mine get left in the front of my bodhrán case only to get accidentally stood on and bent/broken when the bodhrán is being used. Personally I think it’s a fitting end for a whistle I don’t like! 
1.) Pick a simple tune… “Mary Had a Little Lamb,” “Roddy McCorley,” or whatever.
2.) Make a neat little whistle tab sheet for the tune, clean the whistle, and wrap it around the whistle.
3.) Put them with your umbrella. Because they are with your umbrella, you will be more likely to have them with you the next time you encounter a situation where you find yourself waiting, rather bored (family gathering, Dr.'s office, subway, mall, some such busy place.
4.) You now have your daily player on you and the Clarke… you know what to do…
I have a Clarke Celtic…I don’t know what you don’t like about it, but it’s not my favorite whistle either. It seems to me that it requires a certain type of breath control…Each whistle seems to have it’s own requirements…you have to know how to get it to sing. When it was my only whistle, I could make it sing…but it just took more work than say, my Blackbird. But the Clarke has a wonderful breathiness that I also love about the whistle.
If you decide to keep the Clarke…try to find out what it needs from you to make it sing!!! If not, give it to someone the you will open up the door to music!!
Good luck!! Don’t stop playing…just get another whistle!! You will find out that suits you!
Nancy
I don’t look for them when I misplace them.
I never met a whistle I didn’t like.
I gave mine away… mailed them to a young newbie on this list who didn’t have too many resources. I only have one whistle now.
…john