You can clean the toilet safely and cheaply, avoiding expensive products and dangerous fumes. Fill a spray bottle with cheap white vinegar. Pour a cup of vinegar in the toiled and spray the sides of the bowl. Then, sprinkle baking soda in the toilet. Leave it for about 15 minutes. Sprinkle some more baking soda on the brush and scrub the bowl well. The vinegar also dissolves alkali build up, so once a month you can pour one cupful of vinegar in the toilet and leave it overnight.