I've been trying to chase down an annoying squeak for the last year. At first I thought the front U joint might be the the issue, then the front exhaust manifold ring seal. Both have been addressed and still no relief

. The noise only starts after 15-20 minutes of driving, so yesterday I drove around until the noise started, drove home and employed the sharp ears of my S.O. I rocked the car by stepping on the door sill and it seems to be close or at the rear stabilising link at the back of the engine in front of the firewall. Can it be easily removed for lubrication or do I need to support the rear of the engine first? Anything else back there that could be sounding like a bag of mice?
The car is up for sale so I am trying to get this resolved before test drives begin.
Thanks