Pour white vinegar in the bowl - let it sit for 15 minutes. Then pour some baking soda in the bowl - it'll foam for a bit, then scrub with a scrub brush.
After this, you can use plain baking soda.
You can also use Ajax - Ajax has a lot of baking soda and very little bad stuff (compared Comet and other cleaners).
After this, you can use plain baking soda.
You can also use Ajax - Ajax has a lot of baking soda and very little bad stuff (compared Comet and other cleaners).