Emergency Shampoo: Mix 1 egg and juice of 1 lemon and wash hair in cool water
Emergency shampoo indeed!!

I wouldn't imagine it would start to go mouldy... it's just the juice part. And if you got any of the pulp anywhere the worst I think would happen is that it would dry up into something small and crusty looking XD

Apparently you can use it to clean your shower with, and polish brass and copper.
It can be mixed with bicarb soda to make a cleaning paste
AND, you can cut one in half, sprinkle bi carb on the lemon and use it as a sort of spunge to rub stains out of things and remove rust...

Have fun! If you're really that desperate to get rid of them you could cook me a lemon merang pie and post it over Yum yum!