Make sure the aluminum siding is still wet from the rinsing step.
How to take off aluminum siding.
To reach the flange you need to remove the aluminum siding trim around the window but that may prove difficult.
Slowly add hydrogen peroxide until a thick paste forms.
Pull the bottom down and away and then you should be able to simply unzip that piece horizontally across the wall all the way down to the end.
Wash away paste with hot water.
If you re using a traditional chemical sprayer pump the tank until you feel resistance.
Spray tsp onto wet aluminum siding.
Place scraps of wood underneath the edge of the upper piece to expose the nail flange of the piece that you are removing.
If none are loose then start at the top section.
The wood will hold the upper piece of siding out of the way.
If you cannot cut through the aluminum with a utility knife and strength you can use a screwdriver and hammer to get the line started.
With the ryobi chemical sprayer you just pop in a battery and turn it on.
Combine cream of tartar with baking soda.
Combine a few slices of fresh lemon vinegar and warm water in a five gallon bucket.
You will use the utility knife to cut or score two vertical lines on either side of the damaged part of the siding.
Pull out the bottom locking edge of the siding from the section below it with a siding removal tool.
Directly scrub the aluminum siding with a soft scrubber dipped in the mixture.
Rinsing with the solution may also help remove soap scum if you started with the laundry detergent method.
Put on your protective gloves safety glasses and face mask before you start spraying.
Inspect the siding for loose sections.
Use an old rag to rub the paste on aluminum as the best way to clean rust off metal and let it sit for one hour.
A loose siding section may be the easiest to remove.
How much you use depends on the size of your home.