First, let's start with the basics. Our makeup that we use every single day should be sanitized every few weeks, especially if we've been traveling or sick. If someone else has used your makeup for whatever reason, like forgetting their own makeup or simply wanting to experiment with your favorite products and test them out, it's best to clean immediately after each use to ensure no germs have spread. This is important, as we all are exposed to different things at different times, and our friends might be getting over a cold or might have encountered some germs that could cause them to get sick.

Let's try to keep things simple: What should really be the focus when wanting to keep our makeup bag clean and sanitary? Dr Robb Akridge, co-founder of Clarisonic and skin expert (along with a PhD in Microbiology) says, "The best practice is to not share your makeup or brushes with anyone else. The process of sanitizing your makeup with alcohol might ruin it if you're not careful (like powder products and eyeshadows) , so the main focus should be on the brushes, sponges, and applicators."