Shots that show the work.
A before and after only convinces when it is obviously the same place. Take the before photo first, from where you can stand again after the cleaning.
- Same spot, same height, same angle for both photos.
- Lights on and a flashlight in the duct or plenum, so the after is not just darker.
- Fill the frame with the part you cleaned: filter, plenum wall, fan blades, duct run.
- Keep one fixed thing in both shots, like a bolt, seam or access panel edge.
- One area per image. A hood, a duct and a fan make three images, not one collage.
Where the image goes
Text it to the general manager the night of the job, post it on your page, or add it to your Google Business profile. The caption carries the area, facility, date and your company, so it still makes sense when someone forwards it.