It finds nothing because the -name test takes a shell glob and globs don't know \r. Assuming your Cygwin shell supports $' ' notation, you could do:
find . -name '*'$'\r''*'
So, to delete, you can do:
find . -name '*'$'\r''*' -delete
Or, if your find doesn't have the -delete action, use:
find . -name '*'$'\r''*' -exec rm {} +
The -regex test might seem like the best option, but unfortunately, none of the regex flavors supported by find know about backslash-letter escapes (also see this answer):
$ find . -regextype findutils-default -regex '.*\r.*' $ find . -regextype ed -regex '.*\r.*' $ find . -regextype emacs -regex '.*\r.*' $ find . -regextype gnu-awk -regex '.*\r.*' $ find . -regextype grep -regex '.*\r.*' $ find . -regextype posix-awk -regex '.*\r.*' $ find . -regextype awk -regex '.*\r.*' $ find . -regextype posix-basic -regex '.*\r.*' $ find . -regextype posix-egrep -regex '.*\r.*' $ find . -regextype egrep -regex '.*\r.*' $ find . -regextype posix-extended -regex '.*\r.*' $ find . -regextype posix-minimal-basic -regex '.*\r.*' $ find . -regextype sed -regex '.*\r.*'
Only the first one, with $'\r' worked for me:
$ find . -name '*'$'\r''*' ./bad?file
