How clean a white wool Knoll chair?  

3m
Scotchguard fabric cleaner always works very well for me.

Microfiber cleaning rags are ...
Microfiber cleaning rags are also very helpful for cleaning fabric upholstery. I would go as far as to say that they work wonders, compared to just using a typical cloth or rag.

really?
TCHP - what do you use with the microfiber cloths? just water or do you use a product as well? I've always been a bit wary of cleaning marks off chairs so I'd be interested in your experiences...

There seems to be something...
There seems to be something about the fibers of these rags that gets down into the weave of the fabric being cleaned, and helps to remove the dirt. I have typically used a mild soap and water solution, and with the rag only damp, with most of the water wrung out of it. I have tried a number of these rags bought at different places, and they all seem to work well, except the ones that work the best are the ones that are the most plush, and have the most fibers. They seem to be pretty widely available now. I have suggested using them to a number of friends, and have had them tell me they work very well.

how about an eames...
how about an eames upholstered shell chair with grease stains? I was looking up ways to clean wool chairs and have not really come across anything for REAL stains.. not just dirt, we are talking greasy something. Please tell me someone has a magic solution that doesn't involve re-upholstering..

If the option was...
If the option was re-upholstery, I would probably go for broke and try mild solvents that grease is soluble in - mineral spirits, etc. Although a really harsh solvent (acetone, lacquer thinner) could melt upholstery foam, and turn it to goo. Sometimes you will find a stain that is totally resistant to one type of solvent, but will completely dissolve in another (ballpoint pen on leather seems to remove very well with rubbing alcohol on a q-tip). And, if you can test the solvent first on a inconspicuous area of the fabric, that is all the better.

When you say microfiber "rags" do you mean the ones that are towel like? They have a terry cloth type of weave. I have a bunch of these I use when detailing my car.

Yes, they do have that weave,...
Yes, they do have that weave, sort of like a mini-terry cloth. At the store they are generally labeled as "Microfiber". I have seen them sold in aisles of car care/cleaning products, and I use them for that also.

thanks tchp
thanks, going to give that a go!

borax (dry) and a good rub
I used dry borax and 'rubbed' the piece with a clean microfiber material.
Just vacuum up when done. Fairly good results. As always, try in a small area first.

I cleaned some pale gray...
I cleaned some pale gray wool upholstered dining chairs, which I think had greasy food stains, with detergent suds and a damp sponge.
I put a lot of Dawn dishwashing liquid in a lidded plastic bowl with a little water, shook it violently until suds completely filled the container, than rubbed just the suds into the fabric. Dawn is the stuff they used to clean birds and animals who get caught in oil spills, and it worked pretty well for me. When I used up the suds, I just put the lid back on and shook it up again for more suds. When done, I sponged the fabric with clear water until it seemed pretty well rinsed. On the chairs that needed heavier sudsing, I rinsed with more water and then used a wet-vac to suck it out (faster than blotting with towels).