I used it on black plastic trim and found that the initial application was streaky. After allowing it to dry I did a second application. That evened up the streaks and it's held up great for a year.
I have the Wolfgang SCC and it's great. It's several years old and works fine out of the bottle. It isn't going to last over a year though, in wet conditions, less.
In my experience, prerinsing with a hose seems to dislodge some of the contaminants from the paint. IMO that's key. To foam or not to foam, that is the question.
Some companies test in real world conditions. Some of those companies aren't putting a hard time line on their product. My general rule is that what's being advertised should be cut in half for my geographical area.
I don't think it's an issue of who produces such and such product but rather...
Part of the issue is that Blackfire and Wolfgang had a lot of overlap in their product lines. Making one a bulk product and the other one a consumer product makes sense.
I'm assuming that different products are being made by the same factory for different brands. I don't think a factory can...