cleaning aluminum intakes

[musclcar]

looking at my edelbrock TR1-X tunnel ram it's a dull spotted gray finish to it.i've heard of a few ways to clean them and they are: 1) bead blasting 2) spray on acid cleaner 3) easy off oven cleaner.i want to get that new intake look and try and keep it looking good.now to keep it looking good is there something like a clear coat or ?? that won't turn yellow or glossy.