I hated smearing my mascara on my eye makeup all the time, so I decided to try out a mascara shield! I know you can make homemade ones, but this was only a 1$ with free shipping on ebay.
It is honestly really handy. I didn't find the combed end to be that effective, but I opt to use a spoolie brush instead. I can be as sloppy as I want with my mascara application and the mess stays on the shield. Afterwards, it's very easy to clean with a bit of makeup remover. The only thing that might be a problem is the shipping time of a few weeks. Product-wise, no complaints!