Vintage Mid Century 22K Gold CULVER VALENCIA Glass Decanter

Vintage Mid Century 22K Gold CULVER VALENCIA Glass Decanter. I purchased this decanter some years ago in the condition that it is today " no top", couple of small chips around the top as seeing in the photograph. II was a little nervous to wash it out not sure what is the correct way to handle it properly. if the buyer would like me to attempt to clean the bottom of the inside out I would do that or I just thought the buyer would like to do it the proper way if they have any idea how to do that thank you Maggie