That's a great question about maintaining public spaces! Cleaning a heavily stained public trash can requires some specific approaches. First, always prioritize safety: wear heavy-duty gloves, eye protection, and consider a mask, especially if dealing with unknown substances.
For a DIY approach, start with a strong degreaser or a paste made from baking soda and water. Apply it liberally to the stained areas and let it sit for 15-30 minutes. For organic stains like food or mold, a diluted bleach solution (one part bleach to nine parts water) can be very effective, but ensure the area is well-ventilated. Scrub vigorously with a long-handled, stiff-bristled brush.
For the most stubborn, caked-on grime, professional-grade solutions or a power washer are often necessary. A hot water pressure washer can blast away years of buildup. The key is regular maintenance; scheduling cleanings before stains become deeply set makes the job much easier. Remember, keeping our shared urban fixtures clean is a community effort that benefits everyone's health and the city's appearance.