This sounds like something in an ad for Persil. Are your clouds brighter? If not get them Persil-washed!
In fact the clouds are brighter because they have been sprayed with salt water which leaves salt crystals in them. These crystals have greater power to reflect light than the droplets of water, so, from above, the salted clouds seem brighter than your average cloud.
This is an ingenious idea that might help to preserve the Barrier Reef. Cloud brightening could produce a protective cloud layer over the reef that reflects light and heat away from it and safeguards it from coral bleaching caused by the rising temperature of the water.
At the moment it is just one of a number of bright ideas, but if it becomes a real measure for saving the reef, then the frequency of the word could increase markedly.