Wash your clip-in extensions around every 15–20 wears or when you notice product build-up. Gently wash each weft of hair in a clean sink filled with lukewarm water – not too hot – mixed with 2–3 pumps of sulfate- and alcohol-free shampoo. Then apply a moisturizing conditioner and wait 10 minutes before rinsing. Finally, apply a deep-conditioning treatment and leave the extensions coiled in a plastic bag or shower cap overnight. Thoroughly rinse them the next morning and leave to air dry completely. As a rule of thumb, the less you wash the extensions, the longer they will last.