meGrimlock

Hi thanks for the replies. Yes it's a coating on the outside of the windshield. I believe the installer got careless and left the prints on the inside of the windshield. I've had those fingerprints since I bought the car, I only figured it out after my last visit to the dealership. They left a sticker that said the coating will need to be re-applied after 15,000 miles. The "quality" or brand is unknown, but I did try several all-purpose cleaners and one of those "magic" eraser sponges. I will try a 50/50 IPA mix next time. Very annoying because the prints show up when the windows get foggy, so it's hard to show the dealership anything is there at all.

Don't mean to thread-jack. Is the best way to remove a glass coating through polishing? The dealership left fingerprints on the inside of the windshield. No APC or glass cleaner will get it out so I think it's a glass coating like Opti-glass or something. Is there a glass polish I can use on the inside of a windshield? Thanks.

as far as which to use, would GPS be completely excluded from hand application? I've never used a machine polisher, and I have a car with sporty lips and dips and all kinds of contours which I fear a polisher would have a tough time (with my abilities). To remove swirls on a black daily driver, my plan of attack was to apply it by hand on tough-to-reach corners of the car. is GPS just not as effective as a paste like Poli-Seal? not my car, but great examples of where I think i'd use a hand application: rear valance front lip

rinse, as in dunk it in a bucket of water? or ONR? is it enough to spritz a clay lube dilution of ONR and wiping it with MF towel?

thanks for that pic. its a good visual guide! the condition of my car was at the gas cap ahead of the rear wheel, so not too dirty for a rinseless. plus it sat on my paint for about a week. Sounds like Power Clean might be on my shopping list soon.

sorry for the thread revival! I just did my first ONR winter wash and i'm kicking myself. I bought a ton of Creature Edgeless towels from TRC but completely forgot them and was using a brand new MF sponge instead. I pre-rinsed with a hose, used the standard wash dilution, 2 bucket wash/rinse method, and pre-sprayed quick detailer solution on the heavier encrusted panels. The MF sponge became harder to wipe as the road salt became heavier. I too was making the scraping "gritty" sound as it dragged across. I had to wash each panel 3-4 times before the sound and the dirt went away. overall there are no visible swirls or scratches added to the surface, but I am weary of its condition now (there are other issues I have to address--maybe in another thread). so next wash I am going to adjust my method: actually use the dang MF towels this time (that's why I bought them!!). "Garry Dean method" seems sound and I should have attacked it this way to begin with. coin-op car wash w/ pressure spray first change ONR pre-soak dilution? i used 1:16 QD ratio. should I go stronger or weaker? how dirty is too dirty to clean with ONR? Maybe I should use a traditional car wash soap for heavier soils? any other suggestions?