That lens on the BlackVue looks like it really needs a clean - I think I read somewhere that was an issue on the older ones where the excess heat just caused that build up on the inside of the lens after around six months or so?
Not sure if they still have the problem on the newer ones though but it's a pain having to strip it every few months to fix that foggy / hazy issue!
How are you liking the SG so far mate? The video is looking good