
Moisten
Slight Wetness
 Use 'moisten' to imply a light touch of wetness, not soaking wet. 
After peeling the stickers, he moistened the surface to remove the residue.
 Physical Sensation
 'Moisten' can mean to make something feel slightly wet to the touch. 
She moistened the clay before shaping it.
 Neutral Tone
 'Moisten' is neutral and can be used in formal and informal contexts. 
The nurse will moisten your arm with an antiseptic before the injection.