Mine too is always dirty. I wondered the same thing not long ago and
posted here but got not much of a response. One person said their
window stays clear w/o one. Let me know if you hear otherwise :-). I
wonder how tricky the installation is. It seems getting the adhesive
to the right temperature so it bonds well.

_Mike

--- In toyotahighlanderclub@yahoogroups.com, "buddyfinder04"
<agile2000@...> wrote:
>
> OK, I'm getting conflicting information from the web. I have an '05 HL
> base model. It seems my rear window is always dirty and wet (Hey, it
> rains in Oregon...) and I'm wondering about the effectiveness of a
> rear spoiler.
>
> I had one on my '00 Subaru Forester and it did a great job keeping the
> rear window clear. Looking at existing spoilers on other HLs, it seems
> there's a curve on the underside of the spoiler, which tells me it
> directs airflow down the back window.
>
> The dealer wants about $400 installed. I don't want to waste money,
> but I want a clear(er) rear window.
>
> Any real-life experience would be appreciated.
>
> Thanks!
>