I have an awful smell behind my cooker, can't get rid of it. Have cleaned and washed as well as I can, it's really difficult as it's behind the Cooker. There also seems to be some wet on the floor at the back.

HELP! It's really driving me mad and upsetting the household!

Is 'cooker' British for American 'stove' or 'range' with an oven and burners on top?
Is it gas or electric?
If gas, you need to call the emergency phone line of the gas company. The smell could be the stuff they mix in with the (odorless) gas to alert people to leaks.