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All-purpose cleaners won't remove rust stains from sinks, tubs & toilets. Use a stain remover like Super Iron Out. Look for product that contains diluted hydrochloric acid DO NOT USE bleach—it'll set stain. For toilets, add Super Iron Out to the water, clean w/ a stiff nylon-bristled brush. For sinks/tubs, wet surface w/ water. Apply Super Iron Out to a damp sponge (wear rubber gloves & mask, stuff is powerful). Wipe stain w/ sponge until gone. Rinse surface w/ water to remove Super Iron Out.
You will probably ruin the highlighter, but if you’re desperate to get permanent marker off, this will help. After you neutralize the stain, clean it off with soap and water.
You may have to repeat the process every now and again, but it keeps your rings from turning a copper color and you won’t have green stains!