A shoplifter took four bottles of Ariel washing liquid from a store in Abingdon Road.
The theft happened at Tesco Express on Monday at 3.15pm and police are now appealing to a shopper who saw the crime.
Pc Ashley Gardner, from Cowley police station, said: “Another shopper witnessed the theft and alerted staff but did not leave her details. I am very keen to speak to her and would ask her to call 101.”
The thief is described as white, in his late 20s and slim. He was wearing black jeans and a grey hooded top.