Unique 3-in-1 protective formula. Active dirt remover. Weather protection. Karcher Stone Cleaner has a unique 3-in-1 formula including an active dirt remover, a protective formula to keep stone cleaner for longer, and weather protection. This product can be used on stone patios, walls and facades. Highly effective removal of street dirt due to emissions as well as algae and fungus on stone surfaces and facades. Ideal for heavy duty cleaning, this 1L stone cleaner from Karcher is great for domestic cleaning on surfaces. Simply dispense under low pressure and let it work in for a short while, before rinsing thoroughly under high pressure leaving a professional finish, once dried.