I also find shoe covers, even the gripped ones, to be a slip hazard on wet floors - especially tile. We always wear proper work shoes. If a customer has an issue with techs wearing proper work shoes, it's not negotiable - the best I can offer is that shoes can be changed at the door. It's not negotiable. Too much potential for minor to serious injury from cleaning in socks or barefooted or in flip flops. Too much potential for long term and chronic injury to the feet and back by not wearing supportive shoes during a long work week. Do your customers spend their work day barefooted - 100% guaranteed they do not! I respectfully urge you to reconsider cleaning without proper foot wear for your own protection. If you have employees you are violating OSHA regulations if you require your staff to work barefooted. Also, I wish you the best of luck explaining to Workman's Comp if an employee ends up in the ER or doctors's office with a piece of glass or a nail in their foot or a broken toe because they were cleaning in socks!!