Upholstery and Fabrics - Cleaning Leather

Have a recliner with aniline leather. Have used "Guardsman" furniture cleaner to remove hair and body oils from top, rear section of chair. Does not help, enec after 6-7 applications. Have called Guardsman tech, and he recommends professional treatment. What do they use, and is it available? Any suggestions/comments appreciated.

He's right, leather needs to be cleaned professionally.

There are simply too many types of leathers, finishes, and dyes used in the manufacture of leather furniture to make any DIY cleaning recommendations. Most DIY cleaning methods tend to be less than successful.
It is always best to follow manufacturer's cleaning recommendations. Depending on leather, this can vary from vacuum only, wiping only with damp cloth, to applying recommended cleaner/conditioner. There is simply no one cleaning recommendation.
Aniline leather is leather that has been treated with aniline as a dye. It is not colored and is often referred to as naked leather. It can have no finish (full aniline) or different finishes from wax to pigmented finish (semi-aniline).
Again, it is best to follow manufacturer's recommendations for cleaning and maintenance. If in doubt, contact a professional leather cleaner. The use of improper commercial leather cleaners and conditioners can discolor leather and take a toll on dye, finish, and integrity of leather.

Thanks Twelvepole. Have tried saddlesoap recently, and that did not seem to help. Guess the professional route is only recourse.

This is a DIY website and we always recommend hiring a pro for leather - it's just too easy to mess up.

Phil, you mentioned that removing hair/body oils was your goal in your initial cleaning attempt. In an unfinished, aniline leather like what you have, the oils are not on the surface of the leather (where they could theoretically be removed), but have actually migrated into the leather fiber structure. What you'd need is something oil-absorbent to put on the surface of the leather that the oils could migrate into, just as they originally migrated into the leather (unfinished leather is a very absorbent material).
As far as safe home remedies, the only one I could offer is dry corn starch applied to the surface of the leather where you've determined that oils are present (usually presenting as a darkening of leather surface, usually in the headrest or fronts of armrests areas, where repeated exposure is common).
Warming the areas affected by placing a reading or architect's lamp near the area (not too near, at least 10-12 inches away) will lower the viscosity of the oil, and speed the process.
After a few hours, dust or vacuum off (use a soft brush attachment) the corn starch, and then re-apply. It may take many applications to make a noticeable difference, depending on the level of oil saturation, but it's an inexpensive, non-toxic alternative to professional intervention.
If unsuccessful, then I'd echo the other posters that professional help is what's needed.

JMURRAY - Thanks very much. Excellent suggestion, and it is hair and body oil from about 8 years of use. Leather is a pecan colored analine and spots are at headrest and very dark.almost black. Thanks for your time and suggestion.