Possible Clues:

• Cause of wetness? We're told to check sinks
• Croatian regularly dispenses with shower, perhaps
• Nimbus output
• Shower makeup
• Doris ran off, grabbing last bit of soap -- the sign of a shower
• Source of water? Burst drains or pipes initially
• River rapids on rocks -- they could get you wet
• ''... keep fallin' on my head'' (from Butch Cassidy and the Sundance Kid)
• Making inroads with vacant readership — they are wet!
• Shower units, and a hint to three answers in this puzzle