Tax sale: other way to clear the tittle question !

[Kiet N.]

By searching/reading in BP, I have learned that after the barment period expires, the "clouded title" can be cleared by quiet title action.  I believe someone also mentioned about "wait 4 years", but there is very little information on it. I would like to know: is there any legal action involved once the wait is over ? 

Thanks in advance for any inputs !!!!