How can i delete sounds from my project

hi guys i added some sounds to my games but when i delete them they still there in the project. i want to delete them totally not only from the character or the object. i want to delete them from the whole project. because they cause a lot of size when exporting the final product.
can you show me how to delete them

 

go to tools tab at the top and select 'remove unused sound objects'

 

Thanks a lot i really appreciate the help