http://www.beautifuldragons.com/Disinfectants.html

A good resource for disinfectants.

Thymol is in the same family as phenols (5-Methyl-2-(1-methylethylphenol). This family is natural occurring disinfectants and pesticides. It is the same family of chemicals found in wood like cedars and a lot of tropical hardwoods and strong smelling softwoods (pine). Phenols are know toxins for all reptiles (purified forms are just plain very toxic.) Thymol just because it is from thyme oil does not mean the refined form is not toxic. How much it takes to have impact on health is impossible to say as there have been no testing done on reptiles. The thing with all chemicals it is the route of exposure the frequency of the exposure and the concentration that matter.

I would not suggest using any chemical that is in any way related to phenols around reptiles. listerine and the wipes both have the same chem thymol in them, it is common to a number of generic low level disinfectants. The other common one that is suspect is Trilosan that is also a phenol base chem and is very common in anti bacterial soaps.

Listerine undiluted might be effective but diluted the rate of effective use is likely limited. Disinfectants are funny things there is no easy way to know if they work (yes swab tests can be done but at 60-200$ a sample hardly cost effective) The only way to be sure you are actually doing what you think you are doing is to use a disinfectant as the instructions say to use it .And follow all of the guidelines of its use to the letter. Not following the instructions means you have no idea if what you are doing is disinfecting.