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That looks like precast concrete. It is a very high end finish. It looks like somebody tried to clean the brick and the run off streaked the pre cast. I would use SH mixed with a good surfactant like green wash or dragon juice. Apply with a pump sprayer and agitate with a brush. Whenever there are heavy streaks you want a gentile clean. Repeat the process as many times as it takes. If that doesn't work try a concrete brighter. But only after you scrub scrub scrub. Good luck
Is the window trim vinyl or wood ? To me that looks like someone clean the brick with the cleaner and it ran onto the window trim but no one clean the window trim after they clean the house that's what I am thinking. Depending on what the window trim is made out of wood or vinyl that depends on what you would use to clean it with.
Looks as if it is incomplete clean.
Try bleach first. See if it finishes the job.
If not, then an acid may have been used to clean the brick and created damage.
A masonry cleaner will help finish the cleaning in that case.
Have a client that has a very high-end home , around all of the windows the moldings are stained, it looks as if someone already tried to use a chemical and caused streaking. Anyone have any experience with this? If so what chemical recommendations do you have? Thanks