4 ms·An addition: Human urine. This can be useful when inspecting the cleanliness of toilets.by qwezxcrty 4y agoAn addition: Human urine. This can be useful when inspecting the cleanliness of toilets.heelix 4y agoAnd finding out if your pet is not quite house broken.quesera 4y agoStrongly recommend not trying this on hotel comforters. Some things are better left unknown.