Moi, I have started using AppDelete on my mac as I got it cheaply via MacUpdates’ daily Promo Update email and it claims to also delete Preference Files but this is free.
PreferenceCleaner… Preference files can become corrupt and cause an application to become unstable. Alternatively, if an application has a large array of preferences you might find it simpler to delete the files than to locate a setting which has enabled an undesired behaviour. PreferenceCleaner is a utility which aims to simplify the task of deleting preference files. PreferenceCleaner allows you create and store batch lists of files to be deleted in the event that you need to remove the same files repeatedly.