Sour Power probably isn't sour, but we haven't dared taste it to find out. But it looks sour. Like one of those luminous green jelly sweets you used to get in woolies. It does, however, hae a bit of cleaning power, so it's a useful shampoo. And we stuck some No1 grade carnauba in there as well, just to fortify the finish. Don't expect it to replace your wax though. Diluted up to 600:1. It's PH neutral, making it wax friendly, it foams nicely to create a slick wash solution and it also smells of apples.