How to go about disputing a bad job on my 5 year old car!

Hey,

Just stumbled upon this site, looks pretty cool. I bought a Yarris about 5 years ago when they first came out and now the clear coat on the roof is bubbling bad. I had waxed the card at regular intervals, much more than some of my friends and their cars are not even close to mine. I went to the dealer I bought the car from and they basically said “sorry it’s out of warrenty.” Do you think Toyota will help me if I call corporate? Should I call Toyota or the dealer corporate? What about a letter?

Thanks for the advice.