I have pressed 'Delete' on a couple of cameras i know don't exist anymore and also some that has been registered wrongly, but they are still in the POI list.
How long does it take to remove them?
Lastely I have read that magenta is supposed to be transparent in my Garmin Nuvi 200, but i can't get this to work, but i guess i should ask about that in the garmin-part of the forum.
What file did you edit and delete the POIs from: a CSV or a GPX file? If CSV, did you use Excel and delete from within Excel? If a GPX file, what program did you use to view and edit the GPX file?
After you deleted the point in your POI file, did you recompile using POILoader and generate a new POI.gpi file?