Sanding sponges work well.
How to repair dents in aluminum siding.
Hopefully the dent will pop out and the siding will be good as new.
Drill a couple of 1 8 inch holes in the part of the siding that contains the dent.
Using sandpaper take off all the paint.
Place a flat washer onto a sheet metal screw and then screw it part of the way into one of the holes you drilled.
Drill a hole in it drill a small hole in the center of the dent.
Use a putty knife to scrape the surface level with the siding.
It doesn t take a lot of force to pull out the dent.
Next pull on the screw with a pair of pliers.