The Bear's two cents:
Joy works well in fresh water and reasonalbly good in brackish water(read fresh water fed marinias) but to ME, (read Opinion) dawn grease cutter is best in salt water for dish water. For hair try any coconut oil base shampoo. I can't really verify this as I don"t have that problem. For body wash, sorry ladies, Lava! It cuts through every thing, grease, fuel oil, paint and varnish and general crud and is great exfolient. For landry try Borax, though for certain undergarments it may not be the best choice.
Just my views and findings.