when I purchased my 54 accord plastic headlight lenses were dull, checked on internet for some cures without having to remove or replace the headlamps, came across several headlight restoration kits and other remedies all seemed a bit dodgy until I came across this one it was for mothers mag and aluminium shine can be bought through e bay this stuff worked so well on my headlights they are like new the best bit no headlamp removal and no power tools although they can be used and no prepping just mask off the surrounding area around the headlamp I used an old wet wipe keep moist while using and use horizontal and vertical movements this will take sometime I spent about 2 hours on each headlight to get excellent results you can finish with a lens cleaning cloth as this will give even better results, as for the moisture inside seems to be a common complaint get that with mine as well but usually dissipates with warm weather you could try a trick I saw on wheeler dealers blow smoke with a smoke machine into the headlight unit through one of the bulb holders and see where moisture is getting in or dry with a hair dryer every time it gets bad.