If cleaning fails to remove those stains, you might consider dyeing the carpet instead. Wool fibers take dyes very readily.
One of the disadvantages, however, is that it keeps on readily accepting dyes after installation. In other words, stain removal can be a pretty challenging proposition for wool — especially on old stains that have been set with time.
You can remove them with the right products and skill, but don't expect to see that Kool-Aid pop out of your wool carpet like it did on your olefin carpet. Having a cleaning professional apply a high quality wool-safe carpet protector will aid in the removal of potential stains and spots.
LEARN MORE: Is Carpet Dyeing Worth It?
Editor's note: This is an updated version of an article originally published on May 14, 2013.