I use the Pixel Clean wet and dry package from
http://www.pixelclean.com/
I have used it on sensitive LCD screens for 3 HD TV's and my LCD Monitor. So far I have NOT tried it on the Sony PCS 505 but, in case of significant dirt, would try it. Those LCD screens have a thin plastic membrane covering electronics and could be ruined by even a finger print or any other solution.
I never use the spray on version since any loose liquid could penetrate the borders. Instead, I use the Wet and Dry Travel package available here:
http://www.pixelclean.com/product/Pi...Set-of-12.html