5HAKE: Lanolin (wool fat) repels dirt naturally. It's quite simple to remove it by shaking the sheepskin outside, which helps the loosely attached dirty particles fall off. You can also beat it with a broom handle or similar.
BRUSH: Brush your rug carefully. This will remove dust and also make your rug fluffy again if it has gone a bit flat. It is normal for some wool to come off on the brush.
VACUUM: Once shaken and brushed, run a vacuum cleaner over your rug to pick up all other dust and other dirt particles.
FRESH AIR: Leave it hanging outside, preferably when the temperature is a bit cooler.