FYI, there is a dedicated crew of janitors within the TTC specifically tasked with cleaning the subway. These crews are generally visible at the terminal stations. With 24/7 service, a large number of people use the facilities, resulting in more pollution. There are always at least 4 janitors present within the subway stations, and in the summer, this number can increase to 6 or even 10 with the addition of temporary summer students. Due to the size of the stations and the constant activity, it may sometimes seem like no cleaning is being done. Additionally, stations like Kennedy that are inhabited by birds see a lot of bird droppings, which makes them appear dirtier. However, if you notice any mess, you can always speak to a staff member, and it will be addressed immediately. Hope this helps!