Here's one thread on using Pledge, I've read more too. Scroll down to the guy that's been using Pledge for 10 years.
Some say NOT to use Lemon Pledge.
http://www.boated.com/topic.asp?TOPIC_ID=64595
Here's some products for cleaning/preserving eisenglass. I've used other products from Caswell for my car, good stuff.
http://www.caswellplating.com/aids/flitz.htm