I know you can choose which content types to exclude. However, is there a way of removing specific nodes from the Solr index?
Not sure if you've run across this module yet as it is a recent addition to drupal.org but it looks like it's right up your alley.
That's exactly what I wrote the module for. There's a release now and I moved the module to Apache Solr Node Exclude because I botched the project creation the first time.