Oh I'm sure we can get borax, but if the purpose of this is to make cheaper detergent I don't see it happening
I wouldn't start making my own chemical concoctions when I can buy it phosphate free with or without perfume for 1.95 per kilo.
I would however not mind trying soap nuts
The drupes (soapnuts) contain saponins which are a natural surfactant. They have been used for washing for thousands of years by native peoples in Asia as well as Native Americans. Soapnuts are being considered and used for commercial use in cosmetics and detergents as well as many other products.
Soap nuts have historically been used in folk remedies as a mucolytic agent, emetic, contraceptive, and for treatment of excessive salivation, epilepsy, and to treat chlorosis. While they do exhibit anti-inflammatory and anti-microbial properties, the effectiveness of some of these folk-remedy treatments have not been subject to extensive scientific scrutiny. However, modern scientific medical research has investigated the use of soapnuts in treating migraines.
Investigation of the contraceptive capability of plant saponins have shown some spermicidal capacity for certain extracts. While the Sapindus saponins have not been proven be as effective as more commonly used spermicides it has been shown that they are less irritating than chemical alternatives.
Soapnuts, such as those of Sapindus mukorossi, are among the list of herbs and minerals in Ayurveda. They are a popular ingredient in Ayurvedic shampoos and cleansers. They are used in Ayurvedic medicine as a treatment for eczema, psoriasis, and for removing freckles. Soapnuts have gentle insecticidal properties and are traditionally used for removing lice from the scalp.
Now THAT'S some impressive detergent!