Wool is soft. The texture of synthetics varies; nylon can be soft or coarse, olefin is waxy, and polyester is soft with a woollike appearance.
Wool is strong and resilient. Nylon, olefin and polyester are durable, but olefin easily crushes and polyester mats quickly.
Nylon and polyester are available in rich colors. Olefin is usually in muted shades. Wool ranges from off-white to black to earth tones.
According to the WFCA, "wool is the most expensive carpet fiber," making it a more popular choice for area rugs. Nylon is the most expensive and best performing synthetic, while olefin offers the best value.
Clean spills quickly by blotting the liquid with a clean, white cotton or paper towel until the area is almost dry, then mist the stain with a water and dishwashing liquid solution and continue blotting. Martha Stewart's Homekeeping Handbook recommends 1/4 tsp. of dishwashing liquid per quart.
Synthetic carpets and rugs can be deep cleaned by shampooing and hot-water-extraction with machines available from rental companies. To minimize the amount of water left in wool carpet and rugs, professional cleaning is recommended.