Try this stuff ... I re-proofed my strides a week or so ago (they'd been hammered from sea swimming when I was kayaking in the Summer and not washing out after for days - really did restore them).I got a lot of water through my over trousers. Might need to replace those soon.
Nikwax Wash-In TX Direct® (300ml) | GO Outdoors
Just clean out the detergent tray properly first (scrape out any congealed detergent behind it etc. if you don't use in-drum capsules). The detergent interferes with the TX-Direct but otherwise it's one cycle in the washing machine and you're done. Best to clean the trousers first too.
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