Has Thankyou foaming hand wash been dermatologically tested? Sara M September 29, 2020 04:09 Updated Yes! The foaming hand wash products have been dermatologically tested. Related articles What is the pH level of your foaming hand wash range? How does Thankyou work? Who is Thankyou? Is the hand wash range vegan friendly? What is the expiry date of foaming hand wash? Comments 0 comments Article is closed for comments.