How to reduce the size of mercurial hg store. Hg store size is above 5GB and server gets timeout before cloning

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TortoiseHg

Mercurial

Accidently I checked-in 5GB around of files to Mercurial. Our Build server started failing during cloning of repo. So we reverted the checked- in files by using Remove command. But .hg/store/data is still containing those files. And it's size is over 5GB.

How could we remove the bad check-in completely without making it to store in .hg/store/data? Or How could we reduce the size of .hg/store/data?

What I have tried:

We have searched over internet and found few methods, like: hg convert. But hg convert is creating new repo which is not desired in our case. Also we cannot extend the Timeout period of our build server.