Within an error-free Eclipse project, you can simply go to the builder page and remove JARs from the project one by one. Each missing jar with static usage will cause the
java source file decorators to light up (the white "X" in the red circle), which will be an indicator that
you should put it back.
Or you can remove all the jars and just keep adding back until all the errors go away. I've done this from time to time.
Once you've cleaned the list of jars from your project, you should be able to go into the physical library directories and delete the jar files.
I do recommend you archive the project before you do this, though!
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.