A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D2 > D2 - Lights

D2 - Lights Headlights, xenons, foglights. Everything outside the car that glows

Reply
 
Thread Tools Display Modes
  #1  
Old 21st October 2023, 04:32 PM
HPsauce HPsauce is offline
Senior Member
 
Join Date: Sep 2011
Location: Chilterns, almost over HS2!
Posts: 8,419
Default Quick clean of headlight front surface

One of my headlights (nearside) is noticeably yellow and cloudy compared to the other. I decided it was may be time to do something about it.
So I read all the various threads I could find on this and other Audi forums about polishing the headlights; all seemed quite lengthy and brutal.

Looking at the headlights it seemed as if the nearside had some sort of very thin somewhat sticky layer on top that had yellowed and degraded; I wondered if it had been coated at some time in the distant past (before my ownership) whereas the other had not or had even been replaced.

So I decided to start with a gentler approach and in the end set to with Brasso and Silvo! Both are VERY fine abrasives, Silvo the finest, just working by hand.
Amazingly it seemed to work in just a few minutes, all I could manage between showers today.
I did test it first on the outer (indicator) section first before moving onto the section in front of the main beams.

The errant unit is looking a lot clearer and brighter though still has signs of a coating that hasn't yet totally gone. So I'll go back another day and give it some more elbow grease.

It might be worth editing a summary of this into one of the relevant "stickies" which do describe a whole list of varying grit abrasives. I can't find an equivalent measure for Brasso/Silvo though. I also wondered if it was worth trying the stainless steel polish I use on the tailpipe as I assume that also is a mild abrasive.
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!

Last edited by HPsauce; 21st October 2023 at 04:36 PM.
Reply With Quote
  #2  
Old 21st October 2023, 09:09 PM
Ronin Ronin is offline
Banned
 
Join Date: Jul 2019
Location: Wales
Posts: 847
Default

To do it properly you'd have to sand the clear coat off completely and then apply UV resistant clear coat again just like at the factory. I never understood why people Polish headlights, its like painting over mould.

Having said that my favourite lazy method is acetone vapour:
https://youtu.be/cmWxoJLHvF8?si=E4Ce7VtweF9OYsRs
Reply With Quote
  #3  
Old 4th June 2024, 10:38 AM
HPsauce HPsauce is offline
Senior Member
 
Join Date: Sep 2011
Location: Chilterns, almost over HS2!
Posts: 8,419
Default

Quote:
Originally Posted by HPsauce View Post
I also wondered if it was worth trying the stainless steel polish I use on the tailpipe as I assume that also is a mild abrasive.
The answer to that is no, it just made the surface a bit cloudy but didn't remove any more film.
A further round of Brasso/Silvo got it back to "reasonable" again.

I suspect to really get it perfect you need the full aggressive process as followed here: https://forum.a8parts.co.uk/showpost...58&postcount=1

Of course I had the usual two steps backward before any forward.... the trim strip retaining screw managed to escape my clutches and disappeared into bumper cavity.
I eventually found a suitable but ugly replacement but then decided to hunt for the original. Foglight grille off and I could just see it; scraped knuckles and I just managed to retrieve it!
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant.
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one!
Finally: gone, but not forgotten.....
1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!

Last edited by HPsauce; 4th June 2024 at 10:41 AM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 09:36 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.