Softwashing is safe for pets and children following best practices, but it's still important to keep them inside the home while the professionals are cleaning. The cleaning solutions used in softwashing can be harmful if ingested, inhaled, or touched, especially in their concentrated form.
The equipment used for softwashing allows for a control amount of softwashing solution to be applied using low pressure pumping equipment that can still pose a risk of injury if mishandled or accidentally sprayed on someone.
It is best to keep your pets and children away from the area being cleaned until the cleaning process is completed, and please respect the professional completing the work by giving them space and control of your home while they're are completing the cleaning.