What would you not buy from a tax deed sale

[Phil Wang]

Hey experts, I am from Tennessee and recently started to learn the tax sale. It looks like our county has a list of 400 tax sale properties and I just did a little bit search on their titles.

Now I've seen utility lien, existing mortgages, HOA lien, tax lien(ofc), abatement lien, mechanics lien, list pendens, what not. I'm sure there's be more clouds apart from these.

I'd like to know out of all the clouds, which one is the worst to deal with when filing a quiet title and would likely cause you to walk away from the deal.