Jeff:

I wore glasses for about 15 years. A cheap/effective solution is to wash the lenses with a soapy water solution, using just regular old hand bar soap (Ivory works good). When done, leave just a bit of the soapy residue on the lenses, and then wipe the soapy residue off with a optical cleaning cloth as compared to washing/rinsing it off. It will leavea thin invisible coating on the lens that will last quite some time and does a great job of preventing fogging up.