(1) Identify the positive (+) and negative (-) wires for each of the respective LEDs in your washer nozzles.
(2) Splice in the RIGHT LED into the signal for your RIGHT turn signal. (The following connectors are very convenient for this purpose. They are called "T-taps," among other names. They can be had at your local auto parts stores, or Walmart. )

(3) Ground the RIGHT LED at any convenient location on the frame; re-use an OE ground point, if convenient.
(4) Splice in teh LEFT LED into the signal for your LEFT turn signal.
(5) Ground the LEFT LED at any convenient location on the frame.