drop customizations

I have a highly customized version of CRM 2013.

I want to export all the "Microsoft CRM" data into a clean build.

Meaning I want to drop all of the modifications the previous developers have added and start fresh.

Can someone direct me to the best way to do this.

I have tried simply importing the organization in the deployment manager but I get so many errors.

I do not want any of the modifications so thinking the best way to do this might be through SSIS.

But at a loss to the order of the tables that would be require not to loose any of the relationships.

Thanks in advance

Katherine