You may want to try using a non-petroleum based spray product with a spray tube. Something like a silicon based lube product. WD40 or the like can get very messy with interiors.
Locate the latch mechanism, aim the spray tube directly at it and give it a couple of short bursts. Be sure to have an absorbent cloth/rag handy to catch the over-spray. The idea being that it is both lubed and cleaned by the blast.
I just fixed a non-MBZ console latch this way. It, according to the owner, had never worked well until after we did this.