Whether it’s everyday grime or dust mite poo, your mattress might be dirtier than you think. We asked the experts about the best way to remove stains, smells and allergens • The best mattresses – tested Your mattress is not just furniture, it’s family. You drool and sweat into it for hours, have sex on it, and shed millions of dead skin cells into it every night. It shares your DNA. Romantic or disgusting? Either way, that thing needs a wash. Sticking a mattress in the washing machine is clea...