LD Mountain Centre Says:
The bigger version of this product is ideal for those people who have a lot of outdoor gear to maintain and particularly families. Nikwax Tech Wash although specifically designed for use with Gore-Tex and other waterproof membrane fabrics is a gentle wash in cleaner that can be used on any waterproof garments to clean and revitalise them. You can't beat the performance of Tech Wash when maintaining waterproof and breathable fabrics.
Nikwax Tech Wash is a wash-in cleaner for wateproof textiles that cleans safely and revitalises breathability and water repellency. The wash is recommended for Gore-Tex and other waterproof fabrics and used regularly will help improve the lifetime of you garment.
This does what it says on the bottle - easy to use, essential first stage in refreshing of waterproofs. This size is much better value than locally available & LD deliver promptly at competitive price.
Best used with Nikwax TX Direct wash in proofer - unless you have fleece lining, when spray is needed
Nothing else to add really.