Here's my easy way to keep toilets sparkling clean without the use of chemicals. Sprinkle 1/2 cup of borax and 1/2 cup of white vinegar into the toilet bowl and leave it for a full 60 minutes before scrubbing. The mixture will bubble and naturally remove stains and odors. Scrub it with a brush and flush away. You can also put two denture cleaner tablets into the bowl and leave it overnight to remove stubborn stains like mineral buildups.