Twice a year for me. In fact, just had a cleaning this morning by the hygienist and then the dentist takes a look. Didn't find any cavities. X-rays are done once a year.
Also using a BlackVue here, the DR650GW-2CH. Get a dashcam that utilizes a capacitor instead of a battery to retain its internal memory.
Batteries don't seems to last long in an enclosed vehicle...
I didn't get all the water out of a couple of pads that I had cleaned and put them in a Rubbermaid container. Sure 'nough, had some mold on it in a couple of weeks.
I've had my Iron-X Soap Gel for over four years. Now that I just looked at it, it does appear to be a bit cloudy. However, I did use it on my wheels last March and June. Some parts of the wheels did...