Question: How can you keep swimming goggles cleaner longer?

  Options: 
 A. Wipe a smear of sulphuric acid on the inside of the goggles, then wipe it off, it will keep them cleaner longer.
 B. Wipe a smear of toothpaste on the inside of the goggles, then wipe it off, it will keep them cleaner longer.
Answer: B