During weaving , natural raw wool sometimes contains small fibers. These fibres may rise to the surface — and if they do, you can easily, and lightly vacuum them out. Don't panic, fibre loss is normal, and fades over time.
If you want to preserve your Beni Ourain rug, and for long-lasting maintenance, simply clean it with a vacuum cleaner. If it's a liquid stain, then you must be quick on your feet and nimble with your hands. Prevent drying and use paper towels to absorb the liquid. Use shampoo to clean it.
And if you're really doubtful, then hiring the services of a professional dry cleaner is your best choice.