Unchanged: This is how you find them, and delete them:

Script (will show top 10 biggest files):

#!/bin/bash
#set-x
# Shows you the largest objects in your repo's pack file.
# Written for osx.
# @see http://bit.ly/UmpwkV

# @author Antony Stubbs
# set the internal field separator to line break,
# so that we can iterate easily over the verify-pack output

IFS=$'\n';
# list all objects including their size, sort by size, take top 10
objects=`git verify-pack -v .git/objects/pack/pack-*.idx | \
grep -v chain | sort -k3nr | head`

echo "All sizes are in kB's. The pack column is the size of the object, \
compressed, inside the pack file."

output="size,pack,SHA,location"
for y in $objects
do
	# extract the size in bytes
	size=$((`echo $y | cut -f 5 -d ' '`/1024))
	# extract the compressed size in bytes
	compressedSize=$((`echo $y | cut -f 6 -d ' '`/1024))
	# extract the SHA
	sha=`echo $y | cut -f 1 -d ' '`
	# find the objects location in the repository tree
	other=`git rev-list --all --objects | grep $sha`
	#lineBreak=° echo e "\n"*
	output="${output}\n${size},${compressedSize},${other}"
done
echo -e $output | column -t -s ', '

And then:

git filter-branch-force--index-filter \
'git rm-cached-ignore-unmatch $some/file/you/dont/want' \
--prune-empty --tag-name-filter cat -- --all
git push origin master --force

Elsewhere, you'll need to rebase:

git pull--rebase