Cloudy Indicator Lens

Assuming the inside is clean then the problem is caused by UV action and micro-scratches in on the plastic surface, I've restored plastic headlamp and indicator lenses by polishing. Light blooming comes of with traditional toothpaste worked with a damp sponge (toothpaste contains kaolin 'fine china' clay as a mild abrasive also found in some auto paintwork clay bars and polish). Other people have used Autosol polish and soft Dremel wheel. I've tackled tougher blooming with graded headlamp restoration kits like that from 3M, some kits come with a UV protection spray.
 
I have seen also where people freshened up their plastic parts by applying heat to them (just a short while with an open flame). Not sure though if it works on this plastic...?!?

 
Managed to completely remove a huge, buckled dent in my ma-in-law's Subaru rear bumper using a heat gun and pressing it back into shape from the inside.
 
Try Tamiya clear orange paint, sold in hobby stores. Sand off the cloudy bits and polish with 1000/1500 grit then spray with the clear orange. There is very little pigment, so it will take a few coats, but that means it is not easy to go too far. I just repainted the indicator lenses on my Lotus replica and it worked a treat although it took about a dozen light coats. Because there is so little color it is easy to get drips if you spray too much at one time: many light coats is the way to go.

BTW, Tamiya also sell a clear red that works for brake lights.
 
Thanks for info, specially the one about not going out in the sun. Bloody good idea. Tried solvo, bit to course, not very good with heat gun after melting expensive tank badge, will try toothpaste and Tamiya. Thanks again
 
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