How to find out which resources are not used in an android app

I would like to know if there is the way to find out which resources (layouts, strings, colors etc. from res-folder) are not used in my android project.

What I mean, in my app I have some old strings, which won't be used anymore and I would like to remove them from the string.xml

Thank you in advance.

Ps. Я использую Eclipse для разработки