Removing Scuffs From Inside Dryer?
Definitely try Magic Eraser and not a store brand or unbrand. It erasing so many things. I have not tried this for removing scuff marks from inside the dryer, but I did use it for removing purple ink from leaving a pen in my pocket that was more than a year...
Cleaning Well Water Stains from Tub?
Try Lysol toilet bowl cleaner, in the blue/white bottle with the duck like neck. It removes tough stains, like rust and minerals.
Crayons in the Dryer?
Try a magic eraser.
Removing Rust From Baking Pans?
I was given many bread pans that had tough grime and rust and I scrubbed them with a Brillo/SOS pad, removed the rust and grime. From now on, when I wash them, I immediately wipe them dry and put them away to prevent more rust from re-appearing.