That's why I said 90% of the time. The 10% of that time you're either getting lucky with a company producing better stuff or it's on sale.
And to respond to the name brand comment, it may be true with other products like clothing, shoes, but not necessarily with detailing products. The most known brands out there for car care are the turtle waxes and the mothers... That's because they're carried in walmarts and targets.
All I'm saying is that when you buy a brand like turtle wax and you're impressed, be cautious because they're probably selling you short in other areas like protection.