According to the provided information and review ratings, the Public Toilets Jack O'Toole Reserve and the Exeloo Daylight Only Toilet are consistently rated as the cleanest, both boasting a five-star rating. These facilities are praised for their modern design, excellent maintenance, and overall positive user experience. While the Public Toilets Reservoir Reserve are generally clean, they have some reported maintenance issues. For a complete overview of all locations and their respective cleanliness ratings, please consult the full list of public toilets in Kew.