Christmas Ornament

How do I clean an important Christmas ornament?

I have a felt dove with real feathers which came off my grandmother’s casket arrangement from her funeral. It’s just a cheap trinket but it’s very sentimental to me and I put it on my tree every year so she can be with me on Christmas. It has turned yellow and needs to be cleaned. What can I clean it with and how would I do it without ruining it?
The body of the dove is covered in thin felt and it’s wings are real feathers. The feather aren’t that dingy but it’s body is pretty bad.

Brush off any dust with a small paint brush. Mix some 3% peroxide with water (50/50 mix) and use a baby toothbrush to apply. The peroxide will whiten more gently than bleach. Just try not to get it too wet. If you have to do it a couple times, allowing it to dry in between. There’s no need to rinse.

How to make a glitter Christmas ornament