To clean aluminum siding start by mixing water liquid dish soap and white vinegar in a large bucket.
How to clean aluminum siding with tsp.
To prevent the surface from drying out and having to scrub the area again work in three or four foot sections from top to bottom and then rinse.
If you go from the top down you will create dirty streaks through the dirt below that are hard to remove.
Rinsing with the solution may also help remove soap scum if you started with the laundry detergent method.
For aluminum and vinyl always clean from the bottom of the wall up.
Two tips for cleaning.
Directly scrub the aluminum siding with a soft scrubber dipped in the mixture.
Scrub with the length of the aluminum siding starting at the top and working downward.
It wasn t so long ago that trisodium phosphate tsp was a go to choice for tough cleaning jobs especially on exteriors.
Diluted in water and applied often with a stiff scrub brush it can remove.
3 quarts warm water.
Combine a few slices of fresh lemon vinegar and warm water in a five gallon bucket.
Siding brush with extension pole garden hose and nozzle with an angled setting protective gloves safety glasses and face mask.
2 3rds cup of tsp or tsp substitute.
Then submerge a long extendable scrub brush in the cleaning solution.