Just to reinforce what gordonroxburgh said - Dr I. is talking crap. AC is lovingly cared for, and all openings are regularly checked for bird ingress (do we really want to see anti-bird nets stretched across U/C bays, greatly restricting the view into the bay, or across intakes so the ramps and engines would be difficult to see?).
We are very proud of our 'flagship' Concorde at Manchester and love to show people around her.
AFAIK she is the only one where visitors can not only enter the flightdeck, but can actually sit in the P1 seat. As gordonroxburgh says she is regualarly washed and polished, not only by the on-site engineer, but by volunteers as well. Money raised through public tours around the aeroplane goes towards getting her under cover as soon as we can.
Her paint does need touching up in a few places, and did while she was in BA service. She was retired before that was done, but she is in at least as good cosmetic confition today as the day she flew into Manchester late last year.
Come and see her later this month or next summer! (Call the airport tour centre for details).
SSD