Oh my god

Don't use magic eraser on leather! lol
The magic eraser is just an abrasive. Lexus leather is coated with a very thin layer of "dye", either tan, black, gray or whatever which gives it it's color and smooth texture. Over time, this layer's surface takes abuse such as UV radiation, water, stains, heat, cold, stress etc. which over time leads to fading and cracking revealing the brown hide beneath. Most of the time people mistake this 'dark' and shiny look as being dirty, when it's just because it's aged.
Using the magic eraser on the leather's surface will make the leather look almost brand new because it's removing the aged surface of this thin dyed layer, revealing some of the fresh color. But, what you're doing is making the surface even more susceptible to fading and cracking. Now that the dye layer is even thinner, there is less protection. Some may mistake this 'fresh' look as being cleaner, but you're making it worse. Materials from your clothing will begin to stick more rapidly, the dye will fade more rapidly, and it will crack easier as well.
When leather gets to the point where it gets darker and begins to crack (appear dirtier) take it to Lexus. They have a leather guy they hire to do their cars before selling them as CPO's. They ADD dye to the leather, giving it a nice fresh look while ADDING protection.
Regular maintanence is all you can do on your own. Once or twice a year using cleaners and adding conditioners like Lexol is all you should do. Excessive use can decay the stitches and make the dye MORE fragile. Conditioners are used to add oils back into the "hide" to keep the leather soft and pliable. When the layer of dye cracks, the oils evaporate from the hide and make the hide stiff, which causes MORE cracking. It's a vicious cycle.
Bottom line is, keep the layer of dye in tact. It's purpose (besides adding color) is to lock in moisture in the hide, sort of like a sealant. As soon as it begins to crack, the hide will dry out. Conditioners just add the oils back in.
Please don't use magic eraser on leather

most of the time, there's nothing to clean- it's just the surface of the dye getting darker due to UV, friction and just age.