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