My XT660 has xenon headlight fitted for couple of years. It seems that they are not so bright as earlier. I checked headlight and "mirror" surface is quite dirty and it seems matt surface.

Do you have any tips for headlight module cleaning from inside? What kind of cleaner can be used. I have heard that mirror surface is very sensitive and it is not recommend use any cleaning cloth.

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MODs - XTX/XTR wheels - Supermoto front fender - Handguards - Engine crash bars - OTR Bash Plate - Renthal 971 Handle bar - Bi-Xenon lights - Auxiliary Driving Light LED - LED tail light mod - Speedo healer - GiPro gear indicator - Thermometer - Heated Grips - Navigator - Tachometer - 12V Output plug - Front Spacers 30mm + 15W Fork oil - Lowered seat 25mm - Adjustable side stand - Kev Fuel Mod - DNA Stage 1&2