Vaheguru Ji Ka Khalsa, Vaheguru Ji Ki Fathe,
I asked this question to a CK Singh recently and was advised that kes that come out should be burned, if possible with a bit of ghee.
Ardass should be done before thanking maharaj for blessing you with kes and that u are returning it back to him,
Then burn the kes whilst reciting Sohila sahib if at night or chaupey sahib in the day and then, after perhaps do an ardass asking for forgiveness if any mistakes were made.
This is was I was advised as a respectful funeral of ur kes, forgive me if I i've been mistaken on how to do this.
Vaheguru Ji Ka Khalsa, Vaheguru Ji Ki Fathe,