Power wash with a deck cleaning product. If you don't have a power washer you can use a stiff garage brush/broom and deck cleaner and hose it off with an outside hose. You might also try a cleaner like Pine Sol or Mr. Clean in a bucket of warm soapy water.
After you power clean your deck, I have read that raccoons do not like the smell of WD40.
I cleaned with pine sol and with vinegar smell still there I'll try wd40 to keep them away been using my phone with dogs barking
Used the wd40 for raccoons put it around the deck door and kitchen window really works no more raccoons thanks so much