I've heard of the lighter trick, and I've seen it done. That said, I've never had occasion to need to use it, myself, so I lump it in with dive shop defog and other things that are irrelevent to me now (but that I stick in a box in the back of my mind for future reference).
Toothpaste for the initial cleaning, baby shampoo (not diluted) for defog, and an occasional mouthwash-and-toothbrush scrub if I've been in icky water. That's about all I've ever needed.
Toothpaste for the initial cleaning, baby shampoo (not diluted) for defog, and an occasional mouthwash-and-toothbrush scrub if I've been in icky water. That's about all I've ever needed.