I've done some checking and it appears that 303 Fabric Guard is a better product, if one were to want to treat cloth. Here is what I was able to find out
Silicone Fabric Guards may repel water just as well as this product, but that’s where the similarities end. This fabric guard will also repel oil, soil, grease, and dust. Silicone treated fabric lasts on average 2-3 months, as compared to High Tech Guard that protects for up to three years."
Here's a good site that talks about the difference, plus a video
I've ordered a bottle from Amazon, I'll let you know how the application works.