Which thing in your house would you least like to see under a microscope?

You wipe the worktop, rinse it, and leave it by the tap to fester. Experts say it's the grimmest thing in the whole kitchen.

Crisp fingers, a sneeze or two and a trip down the back of the sofa. Nobody has ever given it a proper wipe.

It's been on the kitchen table, in your bag and yes, into the loo with you. Then it goes straight back against your cheek.

Pillowcases get washed, pillows mostly don't. Yours could be older than the dog.

There's a bag of spinach in there that's turned to soup. You keep meaning to deal with it.