Remove the fan shroud, the relay is mounted just to the right, toward
the drivers side, above the fan, just below the shroud. I have heard
it said this part is subject to dampness, due to it's location,
possibly it got wet when you washed the car? I also heard it's not a
cheap part, you might try removing it, drying it and the harness
connector thoroughly, then re-installing. Good Luck!