thoroughly
Wet your hair thoroughly before applying the shampoo.

slightly

with
Wet the towel slightly with warm water.

Wet is used with these nouns as the object:
bed, diaper, lip, pants, washcloth

be, feel, look
become, get, turn
We got soaking wet just going from the car to the house.
The weather may turn wet later on in the week.

get sth, make sth
Mind you don't get your feet wet.

extremely, fairly, very, etc.
dripping, soaking, sopping
His clothes were dripping wet.

a little, slightly, etc.
It's still a little wet outside.

with
The grass was wet with dew.

wet through
We were wet through and cold.

Wet is used with these nouns:
afternoon, autumn, cement, cheek, clay, climate, cloth, clothes, concrete, diaper, dirt, dream, earth, flannel, floor, footprint, grass, ground, ingredient, ink, kiss, month, mouth, mud, nappy, nose, nurse, paint, patch, rag, road, sand, season, shave, sidewalk, snow, soil, spell, sponge, spring, summer, tear, towel, trail, washcloth, weather, weekend, winter