Great white sharks. Trophic Pyramid Information that is in video: An ecological pyramid (also trophic pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
The risk is that you may not be able to remove all the acid and if it is left on the metal it will continue to corrode the metal. So to give you a quick answer, you can use vinegar to etch the aluminum, but you have to rinse the surface thoroughly to remove all the acid residue.
If there is a clear coat on your aluminum you will have to scrub all the way through it and continue scrubbing until the surface of your aluminum achieves the brushed appearance you are looking for. Wash the item with running water and pat dry. Apply a coat of beeswax. Rub it in thoroughly with a clean towel.