I recently bought a 2007 Lexus ES350 nice car but the dash has some sticky stuff on it that
This is a long known issue with dashboards from 2006-2008 Lexus ES & IS's (also affects the 2007-2009 Toyota Camry). Under the heat and sun they get shiny and sticky, with very little which can be done about it except replacement. Luckily, Toyota had a recall program named: customer support program ZE6. If this has never been done on your vehicle, it still may be a valid recall, meaning you should be able to get the dash replaced for free.