Melting / sticky dashboard
Dashboards in hot climates turn sticky and shiny, throwing sun glare onto the windshield. Look at and touch the dash top in direct sunlight — a glossy, tacky surface is the tell. Lexus ran a free replacement program that has ended, so a new dash pad is now $1,000–2,000 out of pocket; use it to negotiate.
Ask for repair records covering this item. If it hasn't been addressed and the car is in or near the mileage window, price the $500–$2,000 repair into your offer — or make it the seller's problem.