Here is how I look at situations similar to this. I am claiming the Detail Guardz to be the cats ass. Others are claiming them to be junk.
So when I find my results to be much less satisfactory than others I want to find out why I am getting such poor results. If I can learn something about my methods/preparation/application then it’s a win for me as I am better prepared next time.
Also I don’t like to admit defeat in anything I do so I won’t give up till I can overcome any issue I am having difficulty with.