This product is absolutely great ... Our toilet is now almost 20 years of the wall. Our previous owners have probably used only cheap stuff for cleaning. The result: it always smelled musty, black deposits down in the crook and below the rim ... we please talk not about it! We have Cillit Bang cleaners and Domol used. Actually, even good products. Nothing helped. Now we were already so far as to buy a new toilet bowl. But my husband was trying to happiness before that these cleaners !!! It was really worth it. And instead of 60 for a new toilet only 2.85! After only 2 applications TOP! No more stink! Of this product we therefore gets 5 stars!