New or good used felt pads. You can replace just the felt, think I saw some repro felt out there somewhere.
The "fix" is to adjust the pads so they arent so tight, its a trade off between tight windows that dont rattle vs not so tight it scratches.
Also the window sweeps can cause or contribute to scratches... there are 2 wide felt pads on the sweeps that the glass rides against, those can scratch too if the felt is worn or glass is to tight against them.
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