I am not sure about polished aluminum to tell ya the truth. Let me go test it out this comming week and I will tell ya what it does. I am sure it will turn the polished aluminum a little white or a faded look a bit because it will probably take off the polish film and pull out that black. But yeah let me check it out. And yeah I just wash the dirt, etc down the drain. It doesn't make a mess that's for sure, and won't turn the driveway black or nothing, it will wash away with the water. A wheel shop told my dad about this stuff a few months back and told my dad to spray it on him wheels before he polishes to make it easier and faster to get the wheels to shine. Ever notice when you polish, you look at the rag and it's all black? Well this pulls that out of course (I only said it a million times haha) and then when you polish it will just shine and make the job quicker. I will test it out this week though on my fathers wheels on his truck and see how it does. I will polish them and then spray it on there. You can delute it with water if you wan't but we don't. It's not meant to be deluted but you can. We have industrial cleaner that we delute more that 50/50 and man that stuff is way too strong, it turned my dads 454 motor all white, everything that was aluminum turned white and you try and polish it and buff it, etc it stays white so not good, gotta be careful.
This stuff is great and along with Simple Green which I am sure you have heard of. Simple Green is more for just grease and oil so if you wan't something like that. That stuff has been out for ages and wont harm your paint or nothing.