I avoid a lot of DIY detail content myself lately. From everything else I’ve seen you really want to avoid using high alkaline cleaners on leather (which includes the steering wheel). Stick to something in the pH range between 6-8.
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CONTENT CREATORS SHOWING YOU THAT THEY HAVE NO IDEA ABOUT LEATHER...
I'm sure all of you have seen those videos in which someone tries to demonstrate how his or her methods of and products for "cleaning" a leather steering work really well, by showing you how much "dirt" they pull off whilst cleaning it.
The issue is that as soon as you spend about 5 minutes informing you about automotive leather, you will know that 99.9% of all automotive leather is coated leather, meaning the actual hide is coated with a primer, base coat, and top coat. The top coat is usually transparent and the base coat is the layer that gives the leather its colour.
So, when you clean a black leather steering wheel and your cleaning tool or towel is showing deep black stuff, then this is not dirt. In fact, in one of the images below you can clearly see the difference between brown-ish dirt and the black stuff. This black stuff is either the leather's base coat or leather dye from a bad leather repair job.
So, unless the car you're cleaning is driven by a coal mine worker, the black stuff you remove from a leather steering wheel is not dirt, it is the leather's base coat - which is the equivalent to the base layer of your car's paint job. Damaged or removed top coat would be the equivalent to damaged or removed clear coat, which means no "protector" or "conditioner" in this world and no "dye" will make this good, only a proper leather repair job in which you rebuild the whole OEM leather coatings will - much like a respray on the exterior of a car.
There's actually a really simple way of knowing whether what you clean off a leather steering wheel is dirt or the leather's base coat: repeat the cleaning cycle. If everytime you repeat the cleaning cycle there's more black stuff coming off, then you know you're not dealing with dirt...
We as consumers need to start being more critical, spread knowledge and hold content creators accountable for spreading wrong information, i.e. if those information can lead people to destroy parts of their cars.
If you want to know how to safely clean leather, here's the short version:
1. Use a vacuum first
2. Don’t use too much liquid (cleaners) and don‘t let fluids soak into the leather, foam up your cleaning liquid and apply it into your chosen cleaning tool
3. Use dedicated leather cleaners as close to pH neutral as possible - not all leather cleaners are created equally, ideally don‘t use anything above pH 8 and below pH 6
4. Don’t use APCs, degreasers, or saddle soap
5. Don‘t use IPAs or cleaners with solvents
6. Primarily use cotton towels, not microfibre ones (old t-shirts or bed sheets are ok)
7. Don’t use steam
8. Don‘t use magic erasers
9. Don‘t use drill brushes
10. Use non-abrasive leather cleaning foam sponges instead of scrub pads or brushes