One of my favorite makeup tools is Disposable Sphere Shaped Mascara Wands. You can find them at Sally’s Beauty Supply if there’s one near you, or you can order a bag of 25 from amazon (link above). I use them to unclump my mascara, and also to unclump my DIY Eyelash Growth Serum. It works much better than a safety pin!
The ones at Sally’s Beauty are Face Secrets, which also is the brand of my Makeup Sponges that I adore. A bag of 12 of them at Sally’s are around $4, and the bag of 25 above from Amazon is $12, so clearly the better buy is Sally’s.