When it comes to recycling your cans, bottles and boxes at home, the most commonly recycled plastics are the ones marked with a No. 1 or No. 2. But there are certain No. 1-marked plastics -- specifically black plastic microwavable trays -- that are most likely NOT recyclable. The distinction is simple: It's usually marked No. 1s, not just No. 1. This is a different grade of plastic resin that is harder to recycle. Your trash provider should be able to tell you if they accept No. 1s plastics, but if in doubt, toss it.