Hi,
When I’m making a high res screenshot, all the white areas, as seen in the photos below, seem to have these black spots on white geometry. How can I remove these?
Looks like noise coming from GI, caused by not enough samples to create smooth lighting in that area. It should become less noisy, if you increase the samples.
Coincidently, just yesterday i watched a video about such noises, take a look for yourself, which kind of noise it may be 
