01 Idle Control Valve Removal

I'm experiencing a rough idle at ~500-600 RPM. Through the reading, I've determined the Idle Control Valve (ICV) may need to be cleaned.

So, to do this, we need to remove the 4 mounting bolts that holds the valve on the engine. We've been successful in removing 3 of the 4. The last one (bottom/forward) is being a real butt. There seems to be NO WAY to get to the bolt head. We've been able to get an electrical connector out of the way, but beyond that, we can't even get the head of the wrench on to the bolt. :banghead:
We're using the smallest 10mm wrench I have - from a set of ignition wrenches.

Looking at it, there doesn't seem to be a way to get to it from the bottom of the car.

Has anyone else fought this battle and won? If so I would be grateful to know your secret.

Thanks,
Bob

there is an adjustment screw on the IAC valve. Before you think you need to clean. I know no one like to hear this but, using the dealer scan tool is the only why i know to have base idle set. There is a fiction in the scan tool to turn off components, so the IAC valve could properly be adjusted. At the same time you could check the function of it. GL...

Thanks for the reply, though I think the idle is set correctly, but the actual idle cannot be attained due to a gummed up control valve.

The only way I can verify this is by removing it, and cleaning it. Therein lies the problem. If someone knows that a run-of-the-mill 10 mm wrench is all that is needed, then it's back under the hood.

However, if I need to fabricate/bend a wrench in order to gain access and remove the bolt, that info is well received.

Has anyone actually done this job on an '01 Altima?

Sorry if I'm sounding a bit frazzled, but htis is more frustrating than it should be.