Whatever she last ate smells like ketchup. Or it smells spicy and acidic, and ketchup is a good enough description for Clownpiece.
Ulp!Master... It smells bad in here...Ketchup...Waaah! Ketchup...?!Okay, let me turn the ventilator on.Clowpi-chan, what smell do you like?Geh!? Is it the Sick Car Syndrome from the VOCs!?