You can and we do but yes salt build up creates skin sores and scalp issues and it never dries also longterm you get mould and it can have negative effects upon your health. Being hygienic is important as when in remote places you need to minimise the need to seek medical support.

You also need to keep in mind that we sail the world so we experience different weather zones and in some places such as SE Asia and the Mediterranean during the dry season we can go months without seeing any rain.