YOU SAID:

No cat is cuter than mine.

INTO JAPANESE

猫は私よりもかわいくありません。

BACK INTO ENGLISH

Cats are not prettier than me.

INTO JAPANESE

猫は私よりきれいではありません。

BACK INTO ENGLISH

Cleaner than my cat is not.

INTO JAPANESE

クリーナーよりも私の猫ではないです。

BACK INTO ENGLISH

Cleaner than my cat is not.