No problem Roger - also another thing you can do to get rid of some little unwanted parts is to select the big things that you know you want to keep, and then invert the selection and delete.

Invert selection is available under the Select tab on the side pane, but it can also be good to set it up as a keyboard shortcut so you can push the I key to do it.

To set up invert selection as a keyboard shortcut, go to Options > Shortcut keys, and add in a new entry. For the Key part on the left side put in I , and for the command part paste in the following:
script:moi.geometryDatabase.invertSelection();

- Michael