You can never have enough...

[Oh_hunnihunni]

Definitely need to machine wash after a salt soak, just to get rid of the salt. Aside from damaging the fibres it isn't good on skin already well hydrated by the bath or shower, and on a face cloth you can taste it. It is a good fixative for some dyes, I'm no chemist but I suspect my school days chemistry was right about osmosis and fluid density. A white vinegar rinse is another good trick with dyes that run, and it is great for hygiene purposes. I do a white vinegar wash on a regular basis in the machine I use in our shared laundry, having seen what some of my neighbours put through them. And because the smell is pretty distinctive I added orange peel to my big bottle of vinegar and it certainly works to add citrus oil and that clean scent to the mix.

Cheaper than the commercial cleaners and just as effective.