true or false _____5. The hand and foot spa machines must be flushed with a solution of about 50% bleach and circulate the liquid through the system for at least 10 minutes. _____6. Leave the solution in the hand and foot spa machines overnight or at least 5-10 hours before draining the machines so that they are thoroughly sanitized. _____7. Tabletops and door handles are wiped with disinfectant and the floor should be mopped with disinfectant as well. _____8. Tools/Implements which are made of porous materials such as nail files, buffers, nail brushes and orangewood sticks can harbor bacteria easily. Since they are wood products which cannot be sterilized, these tools should not be reused. _____9. Waste materials should be disposed properly in an enclosed waste bin fitted with polythene bag. The bin should be sanitized with disinfectant regularly in a well-ventilated area. Remember to wear protective gloves while doing this. _____10. Contaminated wastes should be disposed as recommended by local authority.​