The free option: use your smartphone's flashlight and try to spot unnaturally bright / colored reflection.
If you want to spend some money and don't mind carrying an extra device: probably any of the "hidden camera detectors" on the market will be at least somewhat useful. K18, CC308+, etc.
We're trying with our work to get better or at least equivalent results without having to use external devices.
If you want to spend some money and don't mind carrying an extra device: probably any of the "hidden camera detectors" on the market will be at least somewhat useful. K18, CC308+, etc.
We're trying with our work to get better or at least equivalent results without having to use external devices.