Dirty bottom bracket

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My BB is forever getting dirty to the point where hard pedalling makes my bike sound like its gears need adjusting. To be more precise its dirt on the surfaces between the crank and the BB. I never had to clean it this much on other road bikes so is it possible im missing something? Its no wonder my 1st one was shot within 1300 miles of buying a new bike.
 

fossyant

Ride It Like You Stole It!
Location
South Manchester
What type of BB is it ?
 
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