It sounds like that is a much weaker solution than what I use, so you may want to increase the amount of soapnuts that you use. I use 22 soapnuts in just 1 cup of water (soaked, not boiled). You can see in my siggy link that it makes a nice medium brown color liquid.
Also, with the foam method, make sure you shake it up really good so that the foam is nice and thick, not runny or liquidy. It works way more awesome that way! :-)
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