Deleting old inactive or non-customer contacts with child records

Hello everyone,

I have a list of contacts that does not have any business titles attached to them, and wish to delete the dead weight from our database.  However, the contacts have child records, mainly despositions from our softphone, such as "Left Message" or generic enough.  I've searched the forum looking if there's some way to delete the contacts outright, as the dispositions are worthless.  I understand mostly what the child records are, but since we don't care about the records for contacts we want to delete, can someone point me a way to get this done effieicently and painless?  I have