Used mold removal spray in washing machine steel drum

So I was trying to remove the mold in the rubber lining of the washing machine and thought might as well just spray the drum as well caus there’s probably some there.

Left it over night and now when I wipe the metal drum, there’s orange substance which is left on the towel.

Is this because of the rusting from the metal? I didn’t know that u couldn’t use it on metal. What can I do in this situation?