Hello everbody, I'm new to the forum but not new to lexus. Over the years I have driven an ES250, LS400, and 2 LX470's.
I had an 1999 LX470 w/o spoiler and the back window stayed dirty and dusty (I live on a dirt road) We now have a 2003 with the spoiler and the window is much, much less susceptible to dust and spray. The washer is also much more functional than the '89's. I had considered adding a spoiler to the '89 a few years ago and was quoted a price of $750.00 for the spoiler plus paint and installation.
I have spent the last couple of days reviewing the forum and am quite impressed with the helpfulness of the members and your lexus knowledge.