Do Indoor Outdoor Rugs Get Moldy. Polypropylene outdoor rugs also known as olefin are made from a synthetic fiber and works well in conditions with high moisture and heavy foot traffic. Alternately a rug shampoo should do the trick.
But resistant does not mean they cant build up molds and mildews. If you are going to purchase indooroutdoor carpet and install it in an area that is typically wet you will need to. This applies to decks as well.
Make sure water has a way to drain off.
Furthermore it will not grow mold or mildew when exposed to water strengthening its durability. Remove mold from outdoor carpet by soaking the carpet in vinegar before steam cleaning the carpet or washing it off with a garden hose. The wrong outdoor rug can get moldy when exposed to moisture so choose polypropylene if you expect a decent amount of precipitation. Here are 14 tips on how to prevent outdoor mold from growing in the first place.