Saw an article recently about some new "cleaner" from HH specifically designed for breathables. Probably just washing up liquid but doesnt stop us sailors from wasting our money does it!.
Find it at all good chandleries...probably.
I wash mine in the washing machine with no detergent, doesnt get rid of the engrained dirt but loses the salt, etc.
Breathables positively benefit from washing - the salt crystals block the pores and prevent water vapour migrating to the surface as it should - indeed, it can start reverse wicking because of its hydrophillic nature.
Bung them in a washing machine on a cool setting with a mild detergent and off you go.
I find that breathables, particularly the yellow ones, stain easily and the marks do not come out easily. After a season's hard use they look as if they've kicked around the bilges for a year or two. But they wear, smell and work perfectly well.
You have to be a pretty well heeled yachtsmen to even think about throwing breathables away and getting new ones - or are you changing the hull colour of your yacht this winter?
Correct in all detail - one addition is to buy some detergent from a climbing/outdoor shop for washing them in.
Normally costs around £7 - manufactured by people such as NIKWAX. This is more effective than using spray-on stuff after washing but belt and braces job would be to use both. Important that you buy the correct one so if your garments have a goretex membrane make sure that the detergent is OK for Goretex.
Happy washing and gentle drying and airing.