That's an excellent question! Those textured surfaces on outdoor bins can indeed trap dirt, grime, and sticky residues, making them a bit tricky to clean. Based on my experience and general maintenance advice, there isn't one single "magic" product, but there are highly effective methods and types of cleaners that work wonders.
For routine cleaning, a simple solution of warm water and dish soap (like Dawn or similar degreasing formulas) applied with a stiff-bristled brush (nylon or plastic to avoid scratching) is often sufficient. The brush helps agitate the grooves. For tougher jobs like mold, mildew, or built-up grime, a solution of white vinegar and water or a oxygenated bleach cleaner (like OxiClean) is a great eco-friendly option. Always test a small area first.
For heavy-duty, deep cleaning, a pressure washer on a low to medium setting is the top recommendation. It powerfully blasts debris from the textured patterns without harsh chemicals. If you prefer a dedicated product, look for biodegradable, all-purpose outdoor cleaners or those designed for plastic patio furniture. Avoid abrasive scrubbers and harsh acids or solvents that can degrade the plastic.
The key is regular maintenance—rinse bins monthly and do a deep clean seasonally to prevent buildup. Always rinse thoroughly after cleaning. With these approaches, your bins will stay much cleaner and more hygienic.