How do you get in contact with him ? Progress through the game until you reach level 13, Eddie will then put you in contact with him.
After that, all you have to do is message him, ask for a meeting, meet him with the cash and he'll clean it for you and send it directly into your bank account.
He will take a 40% cut though, meaning if you give him $2000, you'll only recieve $1200 in your bank account but without any rise in suspicion.
It sucks, but at least you won't get noticed by the DEA.
You can only ask for a meeting during the day.