How To Clean A Wool Rug, Including Set-In Stains! Wool rugs are resilient floor coverings that have an extended lifespan. A wool rug may be kept at its best with routine vacuuming and spot-treating stains as they appear, but it's a good idea to give your wool rug a deep cleaning once a year. This article outlines every process required to clean a wool rug, including how to manage stains both as they appear and after they have had time to set in.