Possible Clues:

• Sour substance obtained from milk
• One needs to deal with this after being on the run from LA cops following wild cacti?
• The foreign college upsets most of The City - it's corrosive stuff that leaves a sour taste
• Los Angeles detectives arresting Siberian run out to get result of tough workout?
• Left manoeuvre leaderless with corrosive type - it's bound to turn sour
• It's bound to turn sour for part of the production in Long Island with accountant joining police department
• Built up after training for what¿s not sweet after Milky Way
• Substance in milk and exercised muscles
• Sour part of the milk production?