Don't clean them. Let them wear out & replace with Good Seats - Cloth.
Leather's Hot & Uncomfortable, so why keep them. Marketing has people fooled into believing that they are luxurious. They are CRAP!
Lexus is a Very Poorly "designed" car, made for people, who barely know how to operate. Real POS!! Get rid of it as fast as you can & go to Toyota or Hyundai.