NikWax Tech Wash is a wash-in cleaner for waterproof textiles which cleanes safely, revitalises breathability and water repellency. It is a easy to use non-detergent cleaner for clothing, tents, awnings, marquees, rucksacks etc. Tech Wash's gentle action lifts out dirt and revitalises all water-repellent finishes.
Used this on my motorbike jacket and trousers (Man made fibre). They definately smell better and definately better than washing with just water. But, this one bottle, 300ml (£) did just two washes, 150ml per wash. (FYI it will do 3 washes in a soft water area.)