Anyone who has tried Poorboy's EX can you please share some of your thoughts on the product. I was thinking of trying EX on one of my black cars, but after doing some reading it seems like there are some really mixed reviews. Can anyone help me decide on wether or not I should give this product a try? I am really concerned about the reviews that claim that after they have removed EX it seems as if spots appear that resemble left on EX and they must be removed again. Anyone experience this? Thanks!