Cillit Bang Power Cleaner Odour Stop Unblocker Gel is effective at unblocking tough clogs. This powerful formula works even in standing water, cutting through blockages while cleaning and eliminating odours caused by bacteria. Designed to be safe on all pipes, this gel is suitable for kitchen drains, bathroom showers, baths and basins. Pour 500ml into drains, leave for 30 minutes and flush carefully with hot water. For extreme clogs, leave for longer.