Lena,
 
>From what i have learned, to test if you can still reuse the soap nuts, put 
>them in a bowl and cover with water, agitate with  your fingers and if bubbles 
>come out, it is still good to use. 
 
I put 10 nuts in two cups of water and boiled and simmered until it became one 
cup. It was thicker.  Then i reused four times boiling it each time and it came 
out more watery each time.  so i just put them all together as my shampoo/body 
wash/face wash. I put aloe vera gel, allantoin and urea in it too.  The smell 
is not bad.  I just hope the aloe vera does not come out like dandruff when my 
hair dries.  I tried it as a face wash (rinsed it) and hey, it looks good for 
the skin, some light wrinkles weren't too visible.  Allantoin and urea are good 
skin moisturizers.
 
Take care.
 
Melly