Those things are(were) tire savers, i'd mount them on the leading edge of the front fender & on the rear one. Shoelaces and front derailer touching. Any moveable parts. One bike I had rode it before and after was. The pedal spindle threads, installed and rode with & without grease. Dry sounded like a metal footbridge about to fail. Check under BB, grease it, Try brake mounting bolts, cable anchors. Chain needs , I used Tri-Flow 30 years ago. Could be Fork geometry. That's a separate question.
Try Bike Dued or Bianchi Girl. on Classic. I only ride & repair my own bikes. One last guess? Bottom bracket? I like greasing the Quick release skewer axles. They're fixed, and the wheel spins around them. Is the rear wheel tight enough? Sorry to broadcast a too long reply here, but bikes can Nag us. I get it fixed, in the repair stand, but you gotta ride it. Its just so nice when you're riding along, in an urban area,, its a nice solid quiet bike, passing, many slower cars. Chris