Short answer: yes, in many cases they can be hosed out, but I wouldn’t call it easy for every urban bin. A standard wheelie bin or small public litter bin is usually manageable if you can tip it, drain it, and use a pressure washer or a strong hose. But large on-street bins, underground containers, and fixed public bins are a different story. They’re heavy, sometimes bolted down, and often don’t have a convenient drain, so the dirty water has to be pumped out or collected.
In practice, hosing out an urban trash bin takes more than just water. You usually need to remove loose waste first, scrub the inside with a degreaser or disinfectant, rinse it, and let it dry completely to stop odors. You also have to think about where the runoff goes. In a city, washing bin juice and cleaning chemicals into the street or storm drain is often not allowed, so many councils use professional teams with pressure washers and wastewater recovery.
So if you mean a normal bin at home or a small business, yes, it can be hosed out fairly easily with the right gear. If you mean a big public trash bin on a city street, it’s possible but usually not quick or simple. It’s best to check local rules and, for fixed public bins, leave it to the cleaning crew.