Simple Green is a citrus-based cleaner. It is used for cutting through grease and other stains and is safe for rugs.
Simple Green now makes a concentrated carpet cleaner that is safe for wool.
Simple Green is a concentrated cleaning agent and should be diluted as recommended.
When using any cleaner on a fabric, it's a good idea to find a test spot and check the area for any color changes after applying the cleaning agent.
When using Simple Green to eliminate stains on a wool rug, give it some time to work. Blotting the stain, rather than scrubbing, is recommended.