If you prefer natural alternatives which will not leave chemicals behind, then plants containing saponin will provide a soap substitute (some better than others) In Britain the best known are,
the well named;
Soapwort (Saponaria officinalis)
A soap can be obtained by boiling the whole plant (but especially the root) in water or the best soap is obtained by infusing the plant in warm water. You can also rub the leaves or root with water to produce a reasonable lather. It has the advantage of also being a fungicide and offers some preservation for clothing. Good as a shampoo for dry scalps. Avoid getting it in your eyes or ingesting it as it is an irritant.
the ubiquitous;
Horse Chestnut (Aesculus hippocastanum)
With horse chestnut, the saponins can be easily obtained by chopping the seed into small pieces and infusing them in hot water. This water can then be used for washing the body, clothes etc. Its main drawback is a lingering odour of horse chestnuts. Otherwise you can simply rub some leaves vigourously with some water to create a soapy lather,as demonstrated by Ray Mears.
and the common;
Bracken (Pteridium aquilinum)
Another native plant that has a report of being rich in saponins, the rhizome is used (process as for horse chestnut). Be aware that bracken should never be ingested as it has been shown to be carcinogenic (stomach cancer in cattle for instance)
In the past (and still in use in some cultures, notably rainforest tribes) saponin containing plants were used as a fish poison. I posted details of this use before, here;
fallen horse chestnut
For really good info on plants used for soap check out the;
PFAF - Soap Plants
They also have a great list of plants used to make soap containing 113 species! (not all are found in Britain or Europe);
PFAF - Soap - Plants used directly as a soap substitute. (can't link directly so go to this page and scroll down to 'In the bathroom' and then click 'Soap')
If you want to actually make soap then check out;
The Soap Making Page
Lots of info there.
Happy scrubbing
the well named;
Soapwort (Saponaria officinalis)
A soap can be obtained by boiling the whole plant (but especially the root) in water or the best soap is obtained by infusing the plant in warm water. You can also rub the leaves or root with water to produce a reasonable lather. It has the advantage of also being a fungicide and offers some preservation for clothing. Good as a shampoo for dry scalps. Avoid getting it in your eyes or ingesting it as it is an irritant.
the ubiquitous;
Horse Chestnut (Aesculus hippocastanum)
With horse chestnut, the saponins can be easily obtained by chopping the seed into small pieces and infusing them in hot water. This water can then be used for washing the body, clothes etc. Its main drawback is a lingering odour of horse chestnuts. Otherwise you can simply rub some leaves vigourously with some water to create a soapy lather,as demonstrated by Ray Mears.
and the common;
Bracken (Pteridium aquilinum)
Another native plant that has a report of being rich in saponins, the rhizome is used (process as for horse chestnut). Be aware that bracken should never be ingested as it has been shown to be carcinogenic (stomach cancer in cattle for instance)
In the past (and still in use in some cultures, notably rainforest tribes) saponin containing plants were used as a fish poison. I posted details of this use before, here;
fallen horse chestnut
For really good info on plants used for soap check out the;
PFAF - Soap Plants
They also have a great list of plants used to make soap containing 113 species! (not all are found in Britain or Europe);
PFAF - Soap - Plants used directly as a soap substitute. (can't link directly so go to this page and scroll down to 'In the bathroom' and then click 'Soap')
If you want to actually make soap then check out;
The Soap Making Page
Lots of info there.
Happy scrubbing