Tips for cleaning my Coach handbags?

I have two Coach signature handbags, a white one and a pink one. Since they are such light colors, it has been very hard to keep them clean. I was just in the Coach store today and they recommended their Signature Cleaner which is specifically for the signature bags, not leather or suede. I tried it on both bags when I got home, following the salesman's instructions as well as the instructions on the bottle, and from what I can tell, it has made no difference. I am wondering if anyone else has had this problem, and if anyone knows of another way to get my purses clean without damaging the fabric. Thanks!