Contractors should be allowed to use your bathroom, they are working inside your home so should have respect to not leave a mess and should be offered clean facilities, remember its hard times for them too. Even with the virus today, let them use your bathroom (guest preferably) offer bottle water and sanitary handwashing conditions. Paper towels only and when they have all left glove up, mask up and clean the heck out of the bathroom. If you wanted them to wear a mask you should have asked when you set up the appt.
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