EDIT: For length.
Oxidization and mold are two different things. If it is mold you will want to start with an APC like Shine Supply Solution (1:1) or Gtechniq W5 (straight) and agitate with a microfiber buffing towel. If no improvement over a few passes add in a magic eraser (or stiff bristle brush) and only agitate the plastic trim. This should do the trick on mold. In extreme cases you may need to use an eraser with bleach (1:4 to straight if needed) or even sand and repaint your trim. Be sure to rinse away thoroughly. Once done you want to restore and protect. For this I like Gtechniq C4, Anglewax Corona, Blackfire tire and trim sealant or solution finish black trim and vinyl restorer are good choices as well.
The above looks like it could be mold, but it could be something else. It could be the trim just wearing away completely or something that chemically altered your trim. In these cases you can't do much outside replace the trim, sand and repaint, or APC + trim restorer (live with what is left).
Oxidization and mold are two different things. If it is mold you will want to start with an APC like Shine Supply Solution (1:1) or Gtechniq W5 (straight) and agitate with a microfiber buffing towel. If no improvement over a few passes add in a magic eraser (or stiff bristle brush) and only agitate the plastic trim. This should do the trick on mold. In extreme cases you may need to use an eraser with bleach (1:4 to straight if needed) or even sand and repaint your trim. Be sure to rinse away thoroughly. Once done you want to restore and protect. For this I like Gtechniq C4, Anglewax Corona, Blackfire tire and trim sealant or solution finish black trim and vinyl restorer are good choices as well.
The above looks like it could be mold, but it could be something else. It could be the trim just wearing away completely or something that chemically altered your trim. In these cases you can't do much outside replace the trim, sand and repaint, or APC + trim restorer (live with what is left).