Yep. That is happening to mine too. I bought the car in February and it's parked in my garage at home and under covered parking at work.
I have only had my car since March, it spends every night in a parking garage. It does not get a whole heck of a lot of direct sun. I was it roughly once a week. The rubber window trim is starting to turn light gray, get weird spotty sections, dry out and basically show wear that looks like it would be 10 years old not 10 months. Its definitely not a matter of the trim looking gray against the black car. See pics for reference. Its even happening underneath the mirrors where it shouldn't get any direct sunlight, in theory. Can a power washer cause this? I know there are things you can put on rubber trim to keep it in good shape but this should not be happening so soon.
Golf R CW 4 door base | APR flash 2, Forge WINtake, Scorpion DP, Powdercoated stock wheels black gloss, Soundaktor Delete, H&R Super Sport Springs, Painted brake calibers (yellow).
2013 JSW-S , 2.5L , manual , CW , Carbonio , H&R springs , VMR v710 black, Tint , (wife)
Also FWIW, I used a little diluted Adam's All Purpose Cleaner on the black trim areas and they look new again. Mind you that product doesn't protect or shine it up, just cleans it really well. I just think those areas - for whatever reason - are very prone to getting dirty, discoloring, etc. After cleaning, I used some Adam's Super VRT.
No I don't work for them but I did purchase an enitre detailing package from them during their last sale. So far I am very impressed.
2012 Rising Blue Golf R
APR Stage 3 - RSC - HPFP - IC - RFD / DXD-3E / BSH PCV
Noticed this on my car, then took it in for a full detail and the issue was gone. It's definitely just getting dirty and can be cleaned easily as others have stated.
Are you using any type of dressings on your plastic or rubber parts? Most silicone based products will build up over time and create a haze. A proper detail with get rid of it. This also happens if the cleaner that you spray is not completely rinsed off and you use a dressing on these pieces.
Be sure to use specific products designed for rubber and plastic. If a product is for rubber, it isn't designed for plastic. Avoid "Universal" dressings as these are usually silicone based. Stay away from deep shine products for plastics too. It doesn't take long for a build up to occur after repeated use.