We also include rules about candles, decorative holiday lights, storage of flammable and hazardous materials, smoke and CO detectors, fireworks, portable heaters, extension cords, electrical safety, egress, excessive cluttter and hoarding, and our no-smoking policy. 

They might burn candles all over and ruin the carpets and burn countertops.

I've been in NuSkin, and exposed to Amway, Herbalife, and any number of candle and nutritional MLM's.  

Actually, I walked with my dog for dollars, and wrote down a list of properties that had either deferred maintenance, looked vacant, or had FSBO or hand made For Rent Signs.  

In our case it was carpeting in the master bedroom that the tenant ruined with candles that we replaced with laminate.

And in the real estate case I would struggle to assemble the evidence needed in an audit defense, especially as I live in Asia.I need to consider whether the game is worth the candle, so to say.

I would also recommend citronella candles in the summer.That's what I would do.

The house was spotless and I had autumn scented candles burning when I showed it, a few fake plants in the kitchen.

However, if they are complaining a couple of months into the lease and they knew about the smell before the decided to move in and you didn't mention anything about removing the smell prior to the move in date, I would tell them to light a candle.  

However, in those instances we do inspect and keep a watch to make sure food is not rotting in a fridge, pipes are not freezing, candles are not being used as a light source, etc.