Polish Remover

Kiddo : Nail polish.. Shoe polish... polish - polish
Kiddo {after a brief pause}: Nail polish remover... Shoe polish remover... Amma.. do you know what is shoe polish remover?
Me {waiting for my enlightenment}: No...
Kiddo : MUD!!!! 

Stumped yet again!!! 

Picture Courtesy : sheenananawee.blogspot.in