Feather Christmas Tree How Do I Clean An Important Christmas Ornament?

How do I clean an important Christmas ornament? - feather christmas tree

I have a real meaning pigeon with feathers, which came into the coffin of my grandmother's funeral. It is simply a cheap trinket, but it is very sentimental to me, but I have on my tree every year, so you can be with me at Christmas. He turned yellow and must be cleaned. What can I clean and he could, without doing a fortune?