Punch a hole in the top of a bottle of vinegar and sit the bottle in your toilet tank. In doing this you will save water, as the tank wont fill as much, the vinegar will clean your toilet AND tank on each flush, it leaves the bathroom smelling fresh and it doesn't harm any component of your toilet OR the environment when flushed.====Hmmm.
Heat 1/2 C White Vinegar in microwave for 90 sec. Pour into spray bottle. Add 1/2 C BLUE Dawn Dish Soap. Shake gently to mix. Spray on surface and let sit 1-2 hours. Just wipe it away and then rinse with water.