Toyota 2013 Prius Owner's Manual page 331

Type B
The rear window wiper and washer can be operated when
■
The "POWER" switch is in ON mode.
If no washer fluid sprays
■
Check that the washer nozzle is not blocked if there is washer fluid in the
washer fluid reservoir.
PRIUS PHV_OM_OM47787U_(U)
2-3. Operating the lights and windshield wipers
Intermittent
wiper operation
Normal window wiper
operation
Washer/wiper
operation
Washer/wiper
operation
window
dual
2
dual
305