Nothing brightening here ...
Used as directed, did not do a thing, upped the mixing ratio (as directed), ended up with a stained (gray) aluminum that I need to rinse off and clean with a sponge. Wanted to use this on a motorcycle engine, did the test on a part I was able to take off the engine. Got it cleaner than it was before, but only due to extensive brushing with a sponge and final rubbing with 0000 steel wool to polish it up. Was not really after polished shine, but at least it could have brighten up the aluminum surface, (as the name says), instead it left it dull, grayed and stained which is simply unsightly.<br />Definitely not feasible for a motorcycle engine where you can't get between the cooling ribs.<br />Bottomline, $29 wasted, and Amazon does not take it back due to it being hazardous  ...
Rating: 1 stars