Leather seats look great for about two years, then they start to crack at the bolsters where your hips slide in and out every day. That's not bad luck. It is dirt and body oil working into the grain while the factory coating dries out underneath.
Toyota's own service bulletin on leather and synthetic leather care warns that harsh cleaners and aggressive scrubbing can strip that factory protective coating right off the hide, which is the opposite of what anyone wants from a cleaning session.
