The State Coat of Arms of Ukraine. In accordance with the Constitution, the Major State Coat of Arms of Ukraine is to be established with the Minor State Coat of Arms of Ukraine and the Coat of Arms of the Cossack Army of Zaporizhia taken into account as its chief elements.
1 One method is to place three cups of vinegar into the toilet bowl and scrub the stains with a toilet brush.  Bleach Bleach is a very strong cleaning agent. Place a half a cup of dry bleach powder into the toilet bowl and let it sit there for a couple of hours.
, I have owned a residential cleaning and home management business for 20 years. Lime-Away toilet bowl cleaner (not spray cleaner, which is a different product) is EXCELLENT at getting out really tough stains in toilets. I have been successful cleaning toilets brown with water stains decades old with this product. It may take a few uses, allowing it to sit on the toilet bowl for several minutes at a time, but it will get it clean.