I’ll go first. After your turn the water off in the shower but before you get out, use your hands to wipe off any standing water on your body. Maybe even give your legs a bit of a shake. This way, you won’t drip nearly as much when you get out, keeping the floor and your towel drier.
Life is too short to please everyone.
And certainly do not feel bad saying no to a salesperson. Don’t even feel bad completely ignoring one who approaches you unsolicited.