Washer fluid tank leak - where to access

I’ve been using rain-x bug wash, I know, shame on me…. So either the hose connections, pump or seal is leaking.
Do I access the tank from the top removing the plastic panels, from the bottom by removing the inner fender or both?
I assume it’s the same as the W213 sedan, but not much on the 238 platform.
thanks
OJ



