Removing Smoke Smell - Moved to General Discussion Section

My name in Ron I live in Glendale,AZ
My wife and i are in the process of buying a home. The last owner was a smoker and the hole house is covered with nicotine.It's running down the bathroom walls. The house is a two bed two bath home with vaulted ceiling in living room, kitchen and dining room. Will have a contractor come in and remove the popcorn ceiling. What i want to know is how and what to use to clean the walls with.I have read a lot of post on what to use but would like your suggestion. One post said to use a hydrogen peroxide cleaner other said vinegar etc. Help!!!