This PRAM stores things like which device to boot from, what video cards are enabled, date, time, and other items. It is possible for this information to become corrupted. PRAM Zap routine does a good job saving valid information, Zapping PRAM and then restoring the information. This is a function I have not used much in the past. It claims to be able ot detect certain types of corruption.
Floppy drives get dirty.
Cleaning kits provide a physical solution to cleaning. Unfortunately, the Macintosh does not move the head when a disk is inserted. The Clean Floppy Drive option forces the head to be moved back and forth allowing you to get the most out of your cleaning disk and prevents unnecessary wear on the heads. TechTool also includes a good online help area that explains in a lot more detail the above items and others. TechTool is a wonderful package and we should all thank Micromat for making this utility available to the Macintosh community at no charge.