Need advice on County Treasurer Trustee Auction

[Jonathan C.]

Hello BP members, newbie in REI needs help and advice....

I was driving for $$ and came across this boarded up vacant property. 

Start to lookup the address and found out that it was foreclosed 2 years ago for several thousand $$ and will be auctioned at a county treasurer trustee auction because of 3 years past due property tax.

The county's record shows the deed recorded from the owner to the county 2 years ago, 3 minor liens by the waste disposal company and then there is no more record. 

My questions

1- how do I find out if there is a mortgage/1st lien/bank involved on the property? Do I do a title search or there are other ways to find out from the public record?

2- Am I right to assume that even if I win the bid at this auction, the mortgage/lien not showing up on the county's record will still exist? OR they are all wiped out and I will have a clean title from the county? 

Thanks!!