Sanding sponges work well.
How to repair dents in aluminum siding.
On the bright side aluminum dents and dings are easily repaired without the tools or skills of an experienced technician.
Using sandpaper take off all the paint.
Use a putty knife to scrape the surface level with the siding.
Sand the patch to remove all roughness and paint it to match the siding.
Fill the dent with the two part auto body filler.
It doesn t take a lot of force to pull out the dent.
Next pull on the screw with a pair of pliers.
Hopefully the dent will pop out and the siding will be good as new.