I haven't used PS, but used MANY other products, e.g. WG, #16, P21s/S100, Natty', K twins, etc ...
I can't believe the results I get with my $9.99 bottle of #26. I keep going back to it!
I've never used IW, but I've read that it's high in solvent content and was developed for industrial purposes.
Would continued use present any harm to clear coats?