Here’s the rub: Police are hunting for a knife-wielding thief who knocked off three Manhattan massage parlors over the past week.

In each case, the unidentified Hispanic man, and possibly one accomplice, entered the massage parlors, asked for a rubdown, pulled a knife, then stole between $100 and $300 and fled.

“The man came in with a knife,” said a worker at Green Phoenix Spa on West 46th Street. “The two ladies ran to the restroom and closed the door. The man took the money from their pocketbooks and ran out.”