i use 3 flowers 

Maybe a clear powder coating will be best.


2sav

take it to a radiator shop.

Ok we got plenty of them, what do i ask for

2sav

Pep Boys   Who's that, this is Bullhead were lucky we even got a Kmart.  J/K

Thanks, i  have been doing some searching online aint found chit. So im thinking just keep sanding till all the grooves are gone and then  the dirt wont have a place to get trapped in. ( Spun aluminum)  And then maybe just polish them


Great two more days of sanding.

2sav

you didnt look hard enough...

they even have instructions.

I love it Thats funny. but im talking about the outside of the tank

2sav

The best thing I have found, is hide them behind the upholstery 

I have to say, and not to put Gords Polish in less light, but...
The oxidation on aluminum is easily taken care of by Acids. Thats all thats involved in the science of metal.
We sell a product that for guys with rigs just pray on, hose off and the aluminum looks like it was just polished.
Whats the secret?  Ethylene glycol, Phosphoric acid and Ammonuim Bifuoride, and water, nothing else. it eats
away at the oxidation and leaves the shinny metal behind.
The best part is, your not working your ass off. Now to get it to a high mirror, polish it, but clear coat will not
stick well to smooth surfaces so.... 
you can either:   1) polish all the time,
                        2) use chemicals,
                        3) or etch and clearcoat.
heres a link for one of the acid based products out there, just click on the aluminum trailer cleaners, theres a few to choose from.
http://www.lyndist.com/acidcleaners.html

not for everyone, but it might make someones life easier 

Rebel