As seen on TV.

You'll need
300g pure soap flakes or grate it yourself from pure soap
1 cup methylated spirits
50ml eucalyptus

Here's how
Stir together and store in a jar.

To use
Dissolve one tablespoon in hot water and add to rinse water. No need to rinse - simply squeeze out excess water, roll woolie in towel and dry flat, out of direct sunlight.