I'm a huge supporter of bluechem and I've done and written a review on bluechem engine flushes in ZTH in the past. Bluechem fuel system cleaner probably would have saved me a lot of hassle with my clogged catcon but I didn't have the time to buy one to try.
Personally I think if you use bluechem or vpower racing - it'll work to some extent. The best cleaning method is still taking it out and having it serviced by a mech who has the injector cleaner machine.
I have tried the Bluechem Fuel System Cleaner on my Evo just last week. No difference but my purpose is not to clean injectors (coz my injectors are new) but to remove any water or other contamination from the whole fuel system.
I have also bought the Bluechem engine flush, but haven't used it yet, hopefully it's good.
As for cleaning clogged cats, I have bought another product from UK called Cata Clean, quite damn expensive at rm150/btl! My Swift regular shop sells it and I saw his result looks impressive. Planning to try it on my Mark X.