Where is a self serve car-wash with shampoo machines?

I'm looking for a do it yourself car was that (besides vacuums) has shampoo machines(my car's interior is quite nasty). They are sometimes at only the most upscale of self serve car washes. I live in North Austin and would prefer to find one in this general area. Any help would be much appreciated. I know that I could go down to HEB and rent a shampooer, however I'd prefer not to do that at this time. Thanks