Nic - borax is a very old remedy for lots of things:

Borax is found in creams, lotions, shampoos, gels, bath salts, and bath bombs. It is an emulsifier, preservative, cleansing agent, and a buffering agent. Commonly used in bath salts, borax has the ability to soften the water, and suspend soap particles in the bathwater. The result is soft, clean, and healthy skin, which is not clogged by the residue of soap particles. When used in collaboration with citric acid in bath bomb or bath salt recipes, the product will produce a fizzing action. It also forms bath or body gel, when mixed with water and guar gum. In summary, Borax has the following uses for body care products:

Preservative
Emulsifier
Water softener
Cleanser
Particle suspension
Buffering agent
Fizzing action (when used with citric acid)

You used to get it at the supermarket but I don't know if they still sell, but I assume they do. The old ladies I'm sure would still use it!!!