Just purchased a 2017 accord sport, there is a rubber like seal that is on the inside of the doors that is also white to match the paint. Looks like mold that has grown maybe after never being cleaned.

the dealer tried cleaning with many solutions but it would not come off. It’s not something I can part replace so I need a way to clean or paint I guess....

suggestions? Anyone deal with this or know what to do?

 

If it were mold, a quick wipe with bleach would knock it off; I suspect it is not mold though. My guess it is contaminated body putty (the contaminant may only be cosmetic), so I would simply try touching up a portion with paint (matching Honda touchup paint) after a quick alcohol wipe to be sure whatever previous cleaners have been removed. If that looks OK and the discoloration doesn't bleed through then do the rest.
Since this is a new car, you might be able to have the dealer replace the body putty or at least do the touchup painting for you.
Good luck.

 

Try a tooth brush with goof off,if that doesn’t work,try using a magic eraser for more bite.