Kim Woodburn was on Mumsnet for a Webchat last Tuesday. I'm often asked for the best way clean below the water line of a loo and here's the Queen of Cleans definitive (and eco - yay!) answer. "Brown marks are because you are from a hard water area. Take zero, zero, zero sandpaper and bicarbonate of soda and give it a jolly good rub. Please don't let it build up - don't be lazy!". By the way the sandpaper refers to the mildest you can buy.
Photo credit: Earth Kitsch