Tax deed sale in county

I have a list of current tax delinquent properties in my county that I have scrubbed and filtered through. Out of about 195 properties on the list, only about 25 are worth spending any effort on. I MAY get 3-5 leads or responses if that. 

I was wondering though... some of the properties I have seen on the county tax deed sales list have liens and maybe a loan against it.  If say the county sells the property and there's an excess of funds left after taxed have been paid, would the county pay the 1st, 2nd lien holders? What if the 1st or 2nd lien holders don't receive what was owed to them? Do I as a buyer still get the full deed minus the liens?