"Have no fear of that ring,"
Laughed the Cat in the Hat.
"Why, I can take cat rings
Off tubs. Just like that!"

Do you know how he did it?
WITH MOTHER'S WHITE DRESS!
Now the tub was all clean,
But her dress was a mess!

Then Sally looked in.
Sally saw the dress, too!
And Sally and I
Did not know what to do.
We should work in the snow.
But that dress! What a spot!
"It may never come off!"
Sally said. "It may not!"

But the cat laughed, "Ho! Ho!"
I can make the spot go.
The way I take spots off a dress
Is just so!"

"See here!" laughed the cat.
"It is not hard at all.
The thing that takes spots
Off a dress is a wall!
Then we saw the cat wipe
The spot off the dress.
Now the dress was all clean.
But the wall! What a mess!

From The Cat in the Hat Comes Back.