Totally different ball of wax. 

You arent making candles or selling t shirts.

For my SFH rental in California (San Francisco, a tenant friendly city), I also state: late charge of $25 and $20 per day (not to exceed $200 per month), no candles, no fragrance plug-ins, no illegal drug use, no smoking and no vaping of any products inside the house (I'm okay with weed use in the back yard or outside since marijuana is legal here), tenant mops up standing water, oil spills in driveway, etc.

Hi @David Wax I'm a native Charlottean and have lived here ALL of my 38 years.  

We had a guest a few weeks ago light the fake wicks on THREE fake plastic candles. 

"Excess of normal wear and tear" is not "negligence"...Think negligence as unintentional damage caused by the tenant..things like: candles left burning, stove left on, cigarette on couch, kids stuffing a toy down a toilet, causing the water to back up, etc...That stated, your comment: "Additionally, the renters liability portion would also be another layer of protection between visitors and guests and the landlord.

I got started on this plan at 21 but it wasn't until I was 27ish and burning both ends of the candle for several years that I was able to completely quit my regular job(s) and devote myself full time to my real estate business. 

Cleaning chemicals are an entirely different ball of wax IMO.

If the tenant is burning incense or scented candles or has sprayed air freshener just before inspection, it is a red flag.Even with all of this, a smoker sometimes gets through the net.

You also need appropriate language in your lease or house rules to authorize (and reference) these fees.Examples could include- auger toilet; rekey locks (per cylinder); painting (per room, or SF): cleaning appliance; stripping/waxing per room; carpet shampoo per room; light cleaning; heavy cleaning; trash removal per pickup load...You also need an adequate disclaimer for NON-routine situations- perhaps an hourly charge, or emergency after hours rates, etc.