sponge down
1. To wash, wipe, or moisten with or as with a sponge. I didn't have time to shower, so I just sponged down before heading home.
2. To wash, wipe, or moisten someone or something with or as with a sponge. A noun or pronoun can be used between "sponge" and "down." There's a great photo of my parents sponging me down in the kitchen sink when I was a baby. Dad's making us sponge down the car because we drove it through the mud. The nurse sat by and sponged down the child's forehead to help keep the fever at bay.
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