Rear Brake Reservoir access

[tomewing_imp]

I tried to search on this as I can't be the first to ask this question, but can find nothing, so here goes. I was planning on changing the brake and clutch fluids today. 2013 and they are getting dark. When I tired to open the rear brake reservoir, you cannot get the cap off as it hits the frame. It looks like a "project" to loosen up the reservoir to tilt it, but I see no choice. Can't believe they would engineer it so you cannot open the cap without moving the reservoir. Am I missing something?

Thanks in advance for any help here