Very cool finds - what a great "trash dryer" to stumble upon!
The "Sanitize" selection on the controls was quite likely a higher thermostat cutoff temp than the "Normal" or other settings. GE did this a few years back on their modern dryers, merely an over-dry setting really. Continue tumbling the clothes with the heat on until the exhaust temp reached a certain point - probably 150-160F or so. The germicidal bulbs were way too dangerous by this point to be used in appliances - cancer! What model is your dryer, Brian, I'll see if have the service book to tell for sure.