I have seen this advice given often on MN - a paste of bicarb rubbed into the carpet is supposed to lift smells from it. The other day, ds3 spilt pink flavoured milk on a beige carpet and it smelt awful so i thought I would give it a go. Well, the smell is gone certainly, but I now have a dreadful white stain where the paste was rubbed in.
What have I done wrong/not done?