iv been using lucas gas treatment for a while now, and noticed it makes my engine quiter, and smoother to run. as for cleanig i dunno though. ive read MANY good posts, and reviews about gumouts regane! whats everyones opinion or fact, about both, compared in terms, of reliable effectivness? i mean, if you really wnated to go with one or the other, which would you choose, and why?