We have just had the norovirus spread through our house of 4 boys (and us) and the carpet has taken some serious collateral damage. I have read previous threads about bicarb of soda and have bought some to give it a try, but one website said it can discolour the carpet - has anyone found this to be so ? The carpet has a black base, so I was a bit worried. I have already tried 1001, washing powder (though I did read that washing powder in COLD water was the key). Can't get the smell from under my nose.