You are correct. There is nothing on their website or "FAQ" (Frequently Asked Questions) information indicating how to obtain Material Safety Data Sheets (MSDS). I am sure that they have them, as this is an Occupational Health and Safety Administration (OSHA) legal requirement for all chemical manufacturer`s to have them for any chemical product sold in the USA.
The "problem" is having a manufacturer list chemicals they deem as "proprietary" or "trade secret" for a specific product so as to protect its content and market advantage.
Remember, MSDS sheets are designed to protect and inform the end-user on what they are using chemical-wise and how to properly us it, along with special safety gear (personal protection) they may need in its use, and special medicinal antidotes or environmental procedures that may be needed in the event of an accident or spill.
On Meg`s Detailer Line products, they have the MSDS 4 diamond boxes printed right on the label on gallon jug, although not in the color codes for each safety item.
I would call Mckee`s37 Customer Service line toll free at 1-844-852-5300 from 9 am-6:00 pm EST, Monday-Friday, and 10 am – 4 pm on Saturday.
I know this seems out of line and off-topic, but personal safety should be a concern to all Autopian detailers, both professional hobbyists alike. I would hope a reputable company like Mckee`s 37 that wishes to sell their products to detailers would take that issue seriously as well.