One of our cats sometimes smells like he took a really awful #2 if you know what I mean. Forgive me for saying that but it is absolutely disgusting. LIke if you hold him, your shirt will smell really awful. We have tried washing him and it goes away for a day but the smell ALWAYS comes back. We clean their litter box daily so it's not because of a dirty littler box. Does anyone know what the problem could be? ANy advice?