Hi Milan. Welcome.
We have several members here with BK experience that may be able to offer you some insight.
You might want to read
this for cleaning up IIB accounts and then also read
here. It is talking about how to dispute judgments but you can also try using this method for any public record.
Also be sure to read
Basic Step by Step Beginner's Guide to Credit Repair
Hopefully that will give you enough info to get you started. :D