[quote name='HowieBass' timestamp='1398850646' post='2438150']
Try white vinegar, buy a big bottle from your local supermarket; then fill a bowl with it and submerge the whole bridge. Leave it for a day, then remove, rinse and dry.
[/quote]
Plus the one.
Every household should have some white vinegar - incredibly useful stuff. Disinfectant, scale remover, home-made shower spray...AND mild rust remover.