ispirati

1. to rinse; to wash out
   Posle šampona uvek dobro ispiram kosu hladnom vodom. — After shampooing I always rinse my hair well with cold water.
   Lekar mi je rekao da ispiram grlo kamilicom. — The doctor told me to gargle with chamomile.
2. (of water, rivers, rain) to wash away; to erode
   Reka svake godine ispira obalu kod sela. — Every year the river washes away the bank near the village.

The perfective is isprati (isperem); don't confuse it with ispratiti "to see off".