Hmmm, looked the chinese soapberry up in my Sunset Western Garden bible - not there, haven't googled yet. But the Chilean Soapberry is. In that case, seems to be the bark that is used in Chile for washing, per Sunset. Looks like it might make it growing in my Sunset zone. (Sunset zones cover both cold hardiness and heat).
Hmm, looks like one can buy chinese soapberry seeds online - Sapindus mukorossi. So, will a soapberry seed sprout and bring me a tree?
Also see a mayan soapberry tree.. oooh, and a western soapberry tree, Sapindus drummondii (http://www.arborday.org/treeguide/treeDetail.cfm?id=152)