RGW, you are confusing things. The throttle body (TB) is connected to the intake manifold on the driver's side, and, the air from the air cleaner enters the TB through a large black hose.
You can either remove the TB and clean it, or, as one bricker did, have a helper turn the ignition on/off after removing the air supply hose, and spray TB cleaner into it when the electronic throttle opens.

It almost sounds like you are talking about the oil separator. That does not get cleaned perodically, it gets replaced when it gets gummed up. Replacement is a 5 hour job. The usual indicator is air/smoke coming out of a hot oil dipstick while the engine is at idle. If there is a light vacuum pressure at the dipstick, all is well.

Klaus
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I still miss my 164

I tried once with considerable difficulty. My 1999 V70 was about 50,000 miles old then, and I sprayed a lot of throttle body cleaner in it and the liquid came out clear. At that mileage, it was not fouled or gunked up at all. Two weeks ago, I cleaned the MAF sensor, and it was clean also, so I don't know what to say about how often these things need to be checked.