Just telling you what I read. I don't really do much research because we live on earth and are around all kinds of things that can and do kill us every second of every day. I use Dawn in a bottle every day. Can't be any worse than the food we eat. Normally when I do a bid if someone wants eco friendly cleaners I tell them what ever they want to hear and use the same thing I usually use. All of my stuff has always been in my own unmarked bottles
Here is what I read: The Environmental Working Group gave Dawn a 'D' grade because of it containing methylisothiazolinone, which is a "High Concern: acute aquatic toxicity; Some Concern: skin irritation/allergies/damage". Sounds delightful, right? Dawn also contains 1 4-dioxane which is considered a groundwater contaminant.
Dish soaps, even ones that claim to be 'natural', 'chemical free' and 'made from plants' have the preservative methylisothiazolinone. It is exactly that, parts and in some cases, most of the detergent may be 'natural', 'chemical free' and 'made from plants' but not all of it.
What exactly is methylisothiazolinone and should we be concerned? It is an antimicrobial and preservative in the form of a soluble concentrated liquid or solid that is used in a variety of applications, such as personal care and cleaning products. According to the EPA in the 1998 document, "Reregistration Eligibility Decision, Methylisothiazolinone", Methylisothiazolinone is a highly corrosive chemical that has been found to be toxic when ingested, inhaled, or applied to the skin or eyes in animal studies.
Even Earth Friendly Products, Ultra Dishmate contained methylisothiazolinone! Dish soaps that I see often at the store and would think that they are great actually got 'F's from the EWG. To name a few, Mrs. Meyers and Seventh Generation got very low scores for both personal and environmental safety. Method brand, Green Works, Bon Ami Dish Soap are dish soaps that often claim to be very 'natural' and are anything but ... shame on you all!
Better Life Dish it Out and Planet Ultra Dishwashing Liquid are both detergents that get great scores from the EWG and as far as I can tell don't have any toxic ingredients.
Like I said.... that's what I read. I say use Dawn, it works great. Having had 2 parents die of emphysema and have it myself, Dawn has never harmed me in any way as far as breathing. No worse than the polluted air we breath.
Maybe check Dr. Bonner. I have some of his stuff but nothing works near as good as Dawn. But I guess since the real natural stuff doesn't bubble (hense the need for salt) Dr. Bonner is out because it bubbles up a storm.