I have had a Soir�e in my MB for two years now and the bottom of the bowl has stained badly even though it is cleaned regularly. Today I turned off the water and poured CLR in there and let it soak for awhile. I then scrubbed it with the toilet brush..some came off. I then tried getting the rest with a smaller brush but it is impossible to angle a brush to get to the front inside and you can still see the stains. I had resorted to using colored tablets to hide the staining but I don't like to use them. Thanks for any suggestions for techniques or products that might help.