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Whilst anodizing is often applied to aluminium in order to make the metal stronger and more durable, it can have a negative affect on its appearance and texture. If you would like to polish your aluminium up, you may be interested in learning how to remove the anodizing coating.
Next, you will need to put on some safety goggles and rubber gloves to protect yourself in the case of an accident. Add a little under 1 litre of phosphoric acid to the metal bin for every 15 litres of water that you have previously added. Then, clip a thermometer to the edge of the bin, ensuring that it is touching the water/acid solution. Use a propane torch to heat the solution to about 93 degrees Celsius.
Take the aluminium item that you are hoping to remove the anodizing coating from and completely submerge it in the water/acid solution. Keep the aluminium submerged in this way for 3 minutes, then take it out of the bin. If the anodizing coating has not been completely removed, you can submerge the aluminium for another minute.
Finish by rinsing the aluminium item in clean water, being sure that all of the phosphoric acid has been washed away. Lay the aluminium out on some paper towels or old newspaper and leave to dry.