I typically do not do a wipe-down. The reason for this is because I use products that, to the best of my knowledge, do not contain fillers. Once I polish a section, I'll use the sun, the Brinkmann, or halogens to inspect the area. If it looks good, I move on.
Being a mobile detailer, you're limited on time whether it is the sun, or the persons schedule (especially when they are at work), etc.