They're all wet and soapy! (4)
I believe the answer is:
suds
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for suds that I've seen before include "Foam from detergent" , "Soapy froth" , "Froth made from soap" , "Lather" , "Soapy water" .)