I use PlastX. Got a bottle about a month ago. Have used it three or four
times. Seems to work very well. I used it once, then about three days later,
and then about three or four days after that. Then I used it again last
week. It seems that once you get the yellow buildup off the lens, I haven't
used it as often. It seems that I will need to use it about once a month.
We'll see. Good product though.

Larry
In the back yard, under the oak.