Nikwax down wash direct 1 litre nikwax the global leader in outdoor aftercare is excited to introduce down wash direct the first aftercare product specifically designed to clean and maximise the performance of both regular untreated down and treated hydrophobic down down is a highly effective insulator but quickly loses its insulation powers when saturated with water water resistant down fills such as nikwax hydrophobic down nhd technology address this issue nikwax has developed