title: How to flush invalid SPWebConfigModifications
body: <p>How do I flush out invalid SPWebConfigModifications? </p>
  
  <p>I tried to execute some invalid modifications as part of a solution and now I cannt get rid of them, everytime I run ApplyWebConfigModifications it tries to execute the invalid modifications.</p>
  
  <p>How do flush them out of the system?</p>