I’ve really sorted this as I had a load of gear that had lost it’s DWR…
after normal wash, stick in sink with 250-300ml of Nikwax Tech Wash/garment and ‘hand-hot’ water (more than they recommend).
give it a good sloshing around, then rinse thoroughly, twice.
when still wet, spray on Nikwax TX Direct
(you only really need to do this on the arms/shoulders/seat pad/exposed areas)
wipe off excess with wet cloth.
then bung in tumble dryer on a low set for 10-15 mins or until it feels almost dry, then dry normally.
if you follow this you will transform your kit – I’ve done it with all my biking and sailing gear and it’s transformed.