I bought this product because I saw it on a leather upholstery site, and it was recommended for cleaning car leather. My wife's car has cream-colored leather, which is extremely hard to keep clean and often needs to be retouched with new dye. I bought this hoping to avoid some of those redye jobs, and it does the trick. This removed a lot of dirt from the leather that I thought was worn through and need of another coat, saving me time and effort. This stuff works better than my other leather cleaners, and is my new go-to leather upholstery cleaner.

I made the incredible mistake of spilling coffee onto my leather doc martin boots and let it sit for an unreasonably long amount of time, which inevitably led to an ugly stain on the leather that i was almost convinced wouldn't be fixable. But ofc, chamberlain's leather milk (lol) was the resounding answer online when i was doing my research and i am glad i gave it a chance because it worked wonders, you could never tell there was ever a stain at all!

I had an expensive leather pocketbook that was in a flood and was molded and stained. I cleaned off the mold with alcohol and water and cleaned it with the leather milk cleaner. I went over the pocketbook several times and it almost looks like it did before it was ruined by the flood. I highly recommend this product.

Well it's not milk but cleans well, smells good & not chemically. It's easy on your skin and doesn't leave a residue on the leather. I cleaned a set of front and back leather seats for my car and I still had a bit of product left for touch ups. I combined it with the leather conditioner after and got great results.

Caution I: do not use this on stitching. Stitching usually consists of leather and nylon. This is an ethanol-based cleaner. Ethanol will dissolve and weaken your nylon. To clean your stitching, use water-based cleaners like Leather Master Strong Cleaner for neglected leather or Chamberlain's no.1 for light dirt.

Caution II: this product comes packaged with a terry cotton applicator pad. Do NOT use this pad - it will wear away the coating on your leather. Cotton is a relatively abrasive fiber, Microfiber cloths are strongly preferred.

Update: I used this on a client's 2013 Porsche Cayenne with so-called smooth-finish leather (thinly pigmented). This is the type of leather between standard leather (fully pigmented) and the top-of-the-range "natural" leather. The no. 2 cleaner efficiently removed some scary (though fresh) grease marks, without allowing the grease to soak up deeper into the leather. However, the ethanol together with the terry cloth action caused some light cracks and marks on the leather coating. Using the no. 4 for rehydration, the tiny cracks almost completely filled in and the overall effect is a vast improvement. I do recommend this product, but be careful and gentle.

A few relevant facts about this product and leather:
1. This is not a milk. It is a runny, relatively clear substance. It gets absorbed within seconds and can be used in a spray bottle.
2. This is an alcohol-based cleaner. It penetrates both vinyl and leather, it dissolves most impurities and brings them to the surface for wipe down. In contrast, water-based conditioners neutralize the impurities rather than bringing them out to the surface.
3. This cleaner may remove the dye on uncoated or thin-coated dyed leather. Test and use carefully.
3. Because it is alcohol-based, it evaporates and dries the leather. After using no. 2, you need to rehydrate your leather by using a water-based conditioner. (Chamberlain's no. 1, no. 4 or no.5 are water-based).
4. I chose this product because Chamberlain's is currently the only leather cleaner brand with good Amazon ratings across the product range.

Dyed leathers include aniline, semi-aniline, natural, nappa, stained leather and basically all leather not coated (or not only coated) with vinyl. Includes BMW nappa, Porsche natural, Mercedes nappa & designo, Chanel lambskin. 95% of car leather types are vinyl-coated, also called pigmented (includes BMW standard & dakota, Porsche standard & smooth finish, Mercedes standard, Chanel standard). If your leather does not soak up water or change color visibly when lightly scratched, it is vinyl-coated. However, it may still be dyed and carry a much thinner layer of vinyl than most (BMW dakota, Porsche smooth finish, not sure about Merc & others).

Now onto my subjective impressions: the no. 2 was too gentle to remove some 5-year old sweat and gunk from a leather wheel (standard pigmented leather). One bottle would probably suffice for 8-10 sq ft of leather, or about two neglected daily drivers with a multi-year biuld-up of dirt and gunk, assuming leather seats (front and side sections) and a few leather accessories.

The no. 2 is less viscous and more difficult to work with than the no.4 for example. Too weak for layers of old dirt, but probably too agressive for untreated natural leather. Perfectly useful for a once-a-year refresh of standard leather.