PatM wrote:

(...)

Re Rule #9 (Rain-X). For it to work best, you need to clean your
windshield cleaner than clean! But when CLEAN, and I mean CLEAN, it
works like a charm. The "secret" I've discovered is to use Comet
Cleanser or any cleaner that says "safe for fiberglass". Then it
won't scratch your windshield. With the Comet Cleanser, or Ajax, or
Bon Ami (GM's recommended cleaner), you can scrub your windshield just
like a sink.

Thanks!

Stolen and published.

http://mysite.verizon.net/reswoead/id5.html

--Winston