You don't know what cillit bang is? HOW DIRTY ARE YOUR PENNIES??? 'Hi, Barry Scott here asking whether you have problems with limescale, rust, ground in dirt. Bit of a challange for some house hold cleaners. but not, for CILLIT BANG!!! cillit bang just eats up rust and dirt. so you can spray it on, and tiles gleam! Look how it gets this penny: Good as new!!! ..' That not ring a bell?