The Driver
Detailers Workshop
I just got that - the smart wax - It is kind of expensive for how much you use - I did a load of MF and it said 2-3 ounces - that is almost a 1/3 of a cup. I had a few with some stains on them that did not really come out either, despite the glowing amazon reviews about it getting out year old oils stains lol.
Your only supposed to use an 1/2 - 1 oz. Anymore and it soaps up way too much. Less with more agitation is the key.