My car will not ignite starter
Your first post has your answer.
Contacts of your starter are dirty inside and needs to be repaired/replaced. You can jump the starter with a direct connection to the battery, to get the car started and drive it to a shop for repair.
Search Lexus LS 400 Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Lexus LS 400 Experts