GameTraveler

Typically just the hardware firewall for the SOHO router with the latest firmware update--right now, I'm using a NetGear WNR834B--and making sure to change the internal network IP address from something other than the default. Otherwise, I've been playing around with IPCop on a spare machine which seems to work fairly well and easily enough. On the software side, I've got Peer Guardian 2 running. YMMV

IMHO, I've only typically used a clean microfiber cloth and water. Wipe once with the wet side, and then go over a 2nd time with the dry side. Most products I've ever used, short of Stoner's Invisible Glass for my glass tend to leave that film or some other trace of being used. My $.02