dawn dish washing trick ?

Good question. The Dawn Dishwashing Trick I know of is one that I use to clean our awning and works great as a cleaner and whitener. Equal parts of Dawn dishwashing liquid soap and white vinegar in hot water. There is another formula for whitening that I have never used but heard it works great for stains on clothing - same formula, but instead of vinegar you use hydrogen peroxide. Both could work to whiten and clean the caulking.