@OeKc05 – There are some stain removers made for use on wool carpets. My friend has a foam carpet cleaner that says it is safe for wool.
I think that foam is better than liquid when it comes to wool. It can shrink when exposed to water, so the less moisture in the product, the better.
Also, don't use anything with a bleach or a brightening agent in it on your wool carpet. It will cause faded spots right away, and the color of your carpet will be ruined.
If you still have trouble finding a wool carpet stain remover, try calling a carpet cleaning service. They probably charge less for cleaning one little stain than for cleaning your entire carpet.