|There's more than one way to do things|
I don't even need to detect the encoding. I just want to skip the problematic lines of the file which are gibberish.
I'm sorry, but that really makes no sense at all. If you don't know what the encoding is supposed to be for a given file, there's a good chance that the entire file will be "gibberish".
If you happen to have data created by some idiotic process that concatenates different encodings into a single data stream, you should actually try to find a better process that doesn't make that mistake.
For that matter, if a given file (data stream) can have two or more distinct languages (even if a single encoding is used consistently throughout), then your situation is a lot more complicated and difficult than it would be if different languages were organized in different files as a starting point.
As for how to accomplish anything, it might help if you show us some sample data ("good" and "gibberish"), along with whatever code you've got so far that gives us some idea of what you're trying to do with the data.