Poisons the clouds with acid, dealing 177 Aquatic damage to all enemies. The acid quickly disperses and calls down a cleansing rain for 9 rounds.
During a cleansing rain, the duration of hostile damage over time effects is reduced by 1 round and Aquatic abilities deal 25% more damage.
Drop: Professor Putricide [??+]
Zone: Icecrown Citadel
Approximate Drop Rate: Unknown
Vendor: Naron Bloomthistle
Cost: 1000 (unlimited supply)
Drop: Sha of Pride [??+]
Zone: Siege of Orgrimmar (Flexible, Normal or Heroic)
Approximate Drop Rate: 1 in 125
Quest: Pet Battle Challenge: Wailing Caverns 
Zone: Northern Barrens
Drop: Damp Pet Supplies
Drop: Jademist Dancer 
Zone: Timeless Isle
Approximate Drop Rate: 1 in 200