Hi John, from my experience over the years i have found products with a ph value of between 5 to 10 on the scale to be regarded as safer to use, this is not all about cleaning with micelles based cleaners, and as i have said i am not a chemist, i am being honest in admitting that from many years of cleaning with high alkaline based cleaning chemicals i saw first hand the damage that i caused to my clients surfaces from continuous use of these harsh type chemicals, this applied to carpets,upholstery,hard floors,safety flooring,stainless steel and aluminum surfaces in kitchens,exterior surfaces of vehicles like paintwork,rubbers,vinyls,plastics,alloy wheels,etc,etc, from having over 30 years experience in the cleaning industry i dont need to have a degree in chemistry to know if a cleaning product is safe or not, as i can tell by smell,touch, or look at the safety data sheet, or if i am looking at a new claimed to be safe cleaning product i will just dilute it as recommended by the manufacturer, spray it up into the air then let it fall back on my face,eyes,and skin, if i find it irritating i know such a product will cause detrimental damage to surfaces from continuous use, we get many samples of supposed to be safe to use cleaners but 9 times out of 10 they are alkaline based cleaners dressed up to be different, again there was a time for many years when i was newer to the industry that i took on faith what the larger companies and their reps were telling us about their wonderful safe cleaning products, but as you know you cant beat experience to learn the truth. So if i can play a small part in helping some of the newer guys coming into our industry, on making an informed decision to see if their choice of cleaning chemicals are safe to use, check the ph value on the safety data sheet, and ask your supplier for advice on the different cleaning technologies that are available on the market today, there are many suppliers in the UK promoting safe to use cleaning technologies.