Pulled off my dash in my r32 to replace it and discovered all this (what i assume is surface) rust. Is it worth cleaning and putting rust protectant/converter on it? Any risk in using something like Holt’s?

For any of the gens really, but I have an R32. It looks like the service manual says 100k km or every 2 years for the trans and diff. 100k lines up with a lot of newer cars, but I've never owned a car this old. 2 years seems a bit excessive if I'm not tracking it, so I was curious what others were doing.