Cleaning aluminum heads

[37don]

I have my heads off my 276 after 40000 mi and they needed to be cleaned. Not to dirty but discoloration from heat and exposure has taken them down a notch or two. I tried all the home remedies and wheel cleaners on the first head and it still had that used look. After a lot of time on the internet I tried Mac aluminum brighter on the second head and after just one try the head looks like new again.
I noticed that where I didn't spray the cleaner it left random streaks where it ran down the side of the head. I wet the head and then just sprayed the product on and let it set for about a minute. I have a soft brass brush from harbor freight and just ran it between the fins and what a difference. When done just rinse them off real good because this stuff is an acid base.It is a napa product and not expensive. $6.00 for a spray bottle or $18.00 for a gallon.I will do the other head as you can see the difference between the heads.
Will update when I have them both done. Use protective gear when using this stuff as it has phosphoric acid in it.
Regards, Don