Have Oswald zap the Beetleworx until it becomes stunned. If you are close enough, the view will zoom in slightly and Oswald's remote will emit blue waves. Twist the remote slowly until the waves change to bright green. Then, hold it in position until you are prompted to press a button. Note: This will occasionally have to be repeated.
Defeating the taxi cabs:
When outside Blot Alley at Club 15, hit the cabs on the front, and the hood will break off. Then, jump on the button to stun it, and paint or thin the blot.