It is a tricky one and although I know a little about German genealogy, I am not familiar with Poland.
Have you looked through Cyndi's List for tips?
http://www.cyndislist.com/poland.htmIt might be worth a letter to the town council in Poland.
http://www.lubliniec.pl/?p=263 - address at bottom
In Germany you would need to know the place and date of birth or marriage or death and then you could request a copy of the family register. You would apply to the “Standesamt” of the town, but I guess you don’t have that info yet.
There are some people with the surname in Silesia on LDS, but no idea if they are related.
http://www.familysearch.org/eng/default.asp - search for Jan Poloczek all countries and events
You will also find info on Lublinitz, Silesia on Wikipedia.
Also
http://wiki-en.genealogy.net/SchlesienGood Luck!
Diana