Hi, I'm Rachel Yatuzis and I'm going to show you how to remove stains from your aluminum siding. You don't want to use anything too corrosive. Make sure to check the label of whatever you're using and make sure it's okay for metals like aluminum. It can be recycled indefinitely but it can also rust so, I'd say not to treat, use bleach. Bleach is more for vinyl siding. You can buy some house wash at your local grocery or your local hardware store and put it into a water sprayer. Apply that to the siding and let it sit for about twenty minutes b before you rinse it off with a hose. If you have a pressure washer or you know somebody who has a pressure washer, that's a really quick and easy way to clean your whole house. If there's a lot of stains and you want it all to be the same color, that's a good way to do the aluminum siding also. If you want to make a nice spot cleaner that's really going to cook out the stains if it's really deep or maybe mildew, try mixing baking soda with dish liquid. Make a paste and apply it to the stain. Let it sit for you know, about fifteen, twenty minutes before you scrub it and rinse it off. If you have just a few minor stains, you know, it's just a normal spring cleaning thing and you don't have a pressure washer, if you just get a bucket of water and add some dish soap to it, this is a great aluminum siding cleaner. For any kind of stains, you know, you really want to add a lot of elbow grease. So, I say if you do this once a year, you're not going to have any bad stains build up, so, I'm Rachel Yatuzis and that is how you clean stains off of aluminum siding.