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In General Glass hardness ranges from 4.5-7.5 but steel is in the 4-4.5 range.
Hence the steel wool will not scratch the glass since windshield auto glass is in the 6 to 6.5 range and the side and back windows are in the 7 to 7.5 range.
Ever notice folks using razor blades on glass to remove stickers etc. Thats also safe due to glass being harder than steel.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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