“This one's a life changer just like the Koh toilet brush.... our loos came with some baked on crud when we purchased our house ... it comes from using tank rainwater for loo flushing. I've tried everything to clean this, even getting serious with rubber gloves and a scourer only to find a few days later it's building up...some of it I couldn't get off at all. These tablets got rid of it all the first time I used them with no scrubbing AMAZING! What's more by using one of these once a week it's never come back. I also tried putting them in the cistern and an unbelievable amount of stuff crud came out of there and now they look brand new.”