the outside that's dirty mostly on the hi viz bits. I'll give it a try thoMy Duke of Edinburgh leaders tell me to wash all their hiking gear with Non Biological washing powder.
Apparently that is what you are supposed to wash waterproof stuff with...
I would be tempted to simply run it through a water only wash if im honest with you as my gear doesn't really get all that dirty / sweaty as I wear clothes under every layer.
And I would also get some kind of waterproofing spray to put on afterwards maybe?