I just randomly bought some Lysol Lime and Rust cleaning gel because it was on sale. The regular Lysol toilet cleaner does not touch the rust stains here but this Lime and Rust gel is AWESOME! Follow the directions of drying the bowl so the gel can do it's magic. I did not drain the bowl yet because I figured this was a regular cleaning but it even loosened the stains below the water line more than anything I have seen. I squirted under the rim and around the bowl after the toilet sat unused for about 30 minutes. Tens minutes later the blue gel is turning yellow and I can see the stains dissolving. After about twenty minutes I just used a regular toilet cleaning brush with a scrubber pad (I think these are called Lysol toilet wand) and all of the stains above the water line came off with very little scrubbing.