When I started to store a lot of my make up stash in acrylic storage I made a pact with myself to keep things rotated regularly. The bulk of my make up does still reside in my dressing table so it is very easy for items to get pushed to the back and long forgotten about. So now every week (on a Sunday mostly) I have a rifle through my stocks and switch up my make up the week as it works well as this is brush laundry day too.