A cheap kiddie wading pool and some washing soda will do the trick. Kroger stocks the washing soda. I bought a box last Sunday for a "top secret project" If you don't have a suitable battery charger, I would be glad to lend you one. One thing to be sure of is to not get residue/ witch's brew on concrete surfaces. Unless you enjoy hearing SHMBO say "What were you thinking?"
I wouldn't do the sanding either. Electrolysis, naval jelly, a lot of other ways to get it cleaned up that would be better IMO. Mother's mag & aluminum polish will bring the metal back out after you get the rust off of it.