Bag-all beauty boxes all have laminated inner lining to ensure that any spillages stay on the inside of the makeup bag instead of all over the contents of your suitcase - therefore it's crucial to remove any dust and old makeup that may have accumulated there over time.
Pro tips: Use a new dry toothbrush to reach right into all those corners. Then take a cotton wool pad soaked in eye makeup remover to wipe away any makeup smudges and stains that may have accumulated.
Now that the interior of your makeup bag is clean, let's get rid of those pesky germs. Any antibacterial household spray will do as long as it doesn't contain chlorine, which will harm your beauty box. Simply spray it on, and then apply a dry cloth into the corners. All that's left to do is let it dry, ideally overnight.