You can get to the rear of the rear element just by opening the film door, of course, but to get to the front of it you would have to remove the front element and hold the shutter open using the B shutter speed setting. Then you could CAREFULLY clean it.
Unfortunately, you need a special tool called a lens spanner to remove the trim ring (with the lens information engraved on it) and then the lens itself underneath. A lens spanner can be found at:
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