Mclean in United States offers a unique experience to travellers. A gripping city on its own right, Washington D. C. also deserves a visit. So, ideally any vacation planner would recommend you to visit Washington D. C. for its bountiful attractions like Washington Monument, United States Capitol, Lincoln Memorial on your trip to Mclean. Also, to reach Mclean, you'll have to take a flight to Washington D. C.; so its not really a detour. And even if it is, the city is worth paying at least a quick visit. Most online packages to this city are of 1-2 days.
Yes,it is that simple really! Enjoy your trip! Keep travelling!