Tax Lien Investing

I’ve read and heard the following:

*If the owners of the property continues to not pay the property tax, All mortgages are wiped out? is this TRUE or FALSE?
* How can I own the property "Free and Clean" if the owner does not pay the property tax, and the home goes into foreclosure, he does not file bankruptcy?
*What about the other Liens on the property? Mortgage Liens?
* is this a good investment buying Tax Liens ( to potential become ownership)? free & Clear?

ONLY Real Answers please, NO negative remarks ..
5 points to best answer.

Real experience/professional preferred.

Thank You.
spelling error;
FREE AND CLEAR OF OWNERSHIP

Thank YOU!

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