That's a great question, and honestly, it's a constant challenge for cities everywhere. The "best" way usually involves a combination of methods rather than a single magic solution. First and foremost, consistent and frequent emptying is the absolute foundation. No deodorizer can overcome constantly rotting waste. For the bins themselves, a regular deep clean with a pressure washer and a vinegar or mild bleach solution is crucial to remove the residue that holds smells.
Between cleanings, using a long-lasting odor neutralizer is key. Look for enzymatic or microbial sprays designed for waste. They don't just mask the smell; they break down the odor-causing organic matter. Sprinkling a layer of baking soda at the bottom of the bin before inserting a new liner can also absorb initial odors. Some cities are experimenting with bin designs featuring charcoal filters in the lids or solar-powered odor-neutralizing units.
Ultimately, a proactive approach works best: frequent collection, scheduled deep cleaning, and the application of neutralizing agents. It's about managing the source, not just covering it up. Community efforts to ensure litter goes inside the bin, not around it, also make a huge difference in reducing the overall odor problem.