It's been a couple years since I sent my Sony A77's off to get their sensors clean. I also have a A7 and a A6500 that could probably use a cleaning as well. You don't know just how dirty your sensor is until you shoot a bright blue cloudless sky. Spent an afternoon cleaning the spots from a recent shoot in Lightroom. Both the 77's were pretty dirty.Since my last cleaning the guy who owned the local camera shop decided to change his business. It's now a gun shop. Don't blame, him there's probably more job security than cameras these days.To send them off would cost $45 each plus shipping. About $60 each total.Got these as a stopgap until I could find somebody more local since I have photography stuff almost every weekend.Cleaned the sensors no more crud. Pretty happy with results.Some hints.1. Work on a table in a clean environment. This is not something you do while watching TV while eating pizza with the dog on your lap. Take your time, read instructions. Swipe, don't scrub with the brushes. Don't drench the brush in cleaning solution.2. Have a magnifying glass and a good light source. I used my wife's needlepoint magnifying glass and my 200 lumen LED flashlight. Makes it easier to see the big spots.3. Use a quality air blower. Recommend the Gittos.4. Have a new set of camel hair brushes. Use them only in the most dire instances for cleaning the sensor. I use them on the A77's transparent mirror only. Use them, cover them as soon as you are done.5. DO NOT use compressed air in the mirror box. You will only move the dust around or worse yet, drive it deeper into the box. If you are really unlucky you get a squirt of the frozen CO2 on the sensor, making the job 100% harder.