I think it depends on where your car is parked and if it is wet when you park it.
As a youngster my car had it on the drivers side, but my mothers had it on the passenger side, all to do with where the car is parked in relation to the sun, I reversed in and drove out, she drove in and reversed out. If the window seal is holding water then without sunlight it will go green.
If you clean your car regularly it shouldn't be a problem but to cure it you might want to get a very weak bleach solution in a cup and apply it to the affected area with a tooth brush taking care not to get it on the paintwork and rinse it off.
The car is in fact parked outside.
The rear is facing due South.
So it gets a lot of sun at all angles.
I wash the car about once every 10 days.
I guess thats "regularly"?
I dry it off after I have washed it.
Of course, you can't really dry off what is trapped in the window seal.
<.....to cure it you might want to get a very weak bleach solution in a cup and ....>
Yes, I'll do that.
I was thinking along the same lines.
We have a spray bottle of "Dettol Surface Cleanser".
It says "Non bleach".
So that should be relatively safe to use.
I don't want to damage the door paint and seals!
I had thought about diluting some of that fluid and applying as you suggest.
btw that is the ONLY issue we have had with the car from new.
It has been brilliant.
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