Best Mascara Wand How Do You Save A Mascara Wand After You've Finished The Product?

How do you save a mascara wand after you've finished the product? - best mascara wand

I recently had the mascara BADgal, and the stick is ah-mazing. Spacer is the best I've ever used, so I would separate lashes before applying mascara or even to apply mascara with her.
Thank you all!