Here is a goal: How can you keep swimming goggles cleaner longer?

How would you accomplish this goal?

Pick from:
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.
b).