[Konstantinos]

You will need to set the second parameter to 0 as I already said in my previous post:

pawn Code:

public OnFilterScriptExit()
{
    print("Mapa #Canal se ha descargado correctamente");
    Streamer_DestroyAllItems(STREAMER_TYPE_OBJECT, 0);
    return 1;
}

This will remove all the objects created in that filterscript only. Keep in mind though that if you load the filterscript back again that it loads the objects, they won't be visible until you move or you can use Streamer_Update(Ex) function.