- Check the size
du .git/object or git count-objects -v
- find unwanted files
git filter-branch --tag-name-filter cat --index-filter 'git rm -r --cached --ignore-unmatch filename' --prune-empty -f -- --all
- Reclaim space
rm -rf .git/refs/original/\n
git reflog expire --expire=now --all
git gc --prune=now
git gc --aggressive --prune=now