Joshem, don't be too fussy with frames, just clean the gunk of 'em with a cloth and ensure the glass is clean. It's one thing being meticulous - something many of us tend to suffer with when we first start - but it takes time, and unless I'm charging for it, I wouldn't do it.
What will happen is that you'll just tire yourself of the job, not earn much money for your graft, and then chuck it in and go and do something else.
Wc's post is right with regards the cloths. Just wipe the frames; don't bother with other cleaning agents unless you specifically offer a higher standard of cleaning and charge accordingly.