Take the least amount of foundation and go in circular motion or back and forth to evenly spread it. In the end press it in for a smooth finish. In precision-areas for example around the eyes or under your nose, fold the Silisponge to make it more "pointy". If needed, repeat these steps until wanted cover is achieved.
The Silisponge is super-easy to clean, just wet it with luke warm water and add soap or detergent. If You are a professional user, just clean it with a makeup remover cloth or sanitizer and wipe off.