Kevin, i am so confident that if you have been cleaning a clients Altro safety floor for the past eight years with Aqua mix heavy duty tile and grout cleaner one of the most aggressive hard floor cleaners available on the market and you are trying to tell me there is no chemical burning on their floor, well if you can prove that i will be happy to put my hand up and apologize and no longer be a member on this forum. Bring it on prove it and i will follow through on leaving this forum with my tail between my legs.