I have taken halogens and used glass cleaner and soap on the lens and then dried as well as possible. I put my Disco and Cibie assemblies in an oven at 100deg (no more) until dry. The reflectors I find will scratch so I haven't figured them out yet. The mirror finish doesn't hold up to any type of rubbing.
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Larry K
ASE Certified
58 Jag MK 1 (under restoration)
96 Range Rover 4.6 HSE
96 Discovery 4.0 series 1
03 MINI Cooper S (modified for SCCA competition)
Previous owns:53 XK120,73&79 XJ6,86 V-12 XJS,
64&78 Spitfire,73 GT6 w/72(parts car),(2)68 1600E Cortinas,87 Range Rover Classic