Dr. Beckmann Power-Foaming Toilet Cleaner is a fast and convenient way to deep clean your toilet bowl whilst leaving behind an ultra-fresh fragrance. The innovative formula targets beneath the surface and develops a deep self-activating foam aiding the effective removal of tough stains, odours and limescale. Add hot water to your toilet before using the product to increase the activity of the foam. Important Information TOP TIP Adding HOT WATER to the toilet bowl first (before adding the powder) will increase the activity of the foam. /.