fixing duplicated history

Hi,

I have a git tree which history is completely messed up with duplicated entries. By reading git man pages I saw that it might be possible to delete those duplicated entries with git reflog delete, am I reading it right ?

If so, would it cause any problems to the users who already cloned the original tree ? I mean, will git see it as a different history line and try a merge or will it figure it's the same tree with the duplicated entries removed ?

Thanks in advance for the help