How do I tell my wife I think she used a facecloth to clean the toilet?

I was loading the washing machine
And looking for clothes already walked y
So I smelled this wet facecloth
Omg it smelled of piss. Stinky piss

And the only explanation I can think of is that my wife uses it to clean around the toilet

How do I even say that to her?
How do I tell my wife I think she used a facecloth to clean the toilet?
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