If the car has the vertical open feature on the hood, there should be a squeeze clamp fixture on each hood hinge (looks a bit like a clothes pin). On mine, after the hood is up to normal position, I pull the hood closed about an inch and squeeze the driver side clamp, which pulls a pin out of the way and allows the hood to open a little further than normal. Repeating this process on the passenger side alows the full vertical position to be accessed.
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E