Poly is an artificial material made from high density polyethylene HDPE. HDPE is, essentially, durable recycled plastic from milk jugs, laundry detergent bottles, and water bottles.
Poly is mainly used in the manufacturing of outdoor furniture from recycled plastic. This plastic would otherwise end up in landfills or oceans. Their furniture is both attractive and durable and can last for years with proper care.
The difference between traditional outdoor wooden furniture and poly, is that poly is naturally weather resistant and easy to clean. You will never have to waste valuable time sanding, refinishing, or resealing your poly furniture. Of course, just like anything left outside, it will get dirty with mold and mildew. There are a few simple ways to clean poly lumber furniture and remove dirt and debris.
First, for general cleanup, fill a bucket with warm water. Gather up mild dish soap, a sponge, and a hose, and you are all set. Just like washing your car after a rain shower, start with a soapy sponge, and from the top down, clean all surfaces and nooks and crannies.
Then, spray off the poly furniture with clean water from the hose and allow it to dry before using it again. Some people will simply use a magic eraser.
Mix a combination of 1/3 bleach with 2/3 fresh water in a bucket. This is necessary if you live in an area with heavy pollen or dust. Wash with this solution just like you would with dish soap and water in a bucket.
There is no need to worry about the bleach discoloring your patio furniture. Once you are done washing, rinse with the hose and watch as each piece is restored to its original brilliance.

You may also use a pressure washer to clean outdoor furniture if it does not exceed 1,500 PSI. If any higher, you may cause damage to the material. After using the power washer, any residual dirt can be loosened with a soft bristle brush and rinsed away. Please make sure you remove any outdoor cushions before you start.
Finally, most poly pieces are assembled with stainless steel hardware. If the hardware starts to rust or corrode, first wash it with soap and warm water using a bristle brush to see if you restore the shine to your liking. A commercial rust remover can be used if necessary.
Now that you have turned your yard into a clean, outdoor living space, you can entertain and enjoy family and friends, or just relax in nature after a busy day, as you make new memories, for years to come.