Tax Defaulted Sale by County

I have a few questions regarding tax defaulted sales I hope you know the answers:
1.If I buy a tax defaulted property from the county, do I get title transfer right away or is it like a tax lien sale that owner have time to redeem?
2. At these auctions, does all previous lien get wipped out?
3. Does ForeclosureRadar has information on these properties?

Thank you, Mc

ForeclosureRadar does not track defaulted property tax sales.