Thanks juan but once again these cleaning routines do not address the "Other" mystery memory hog in iOS. They are discussing the app cache which is easily cleaned as described in all the referenced procedures. There are thousands of posted cache cleaning instructions, all pretty much offering the same elementary procedure to free up tiny bits of app cache memory. None, except the Backup / restore and redo all the settings, seem to work to recover the big problem which is that "Other" memory loss.
I did like the one suggestion that recommended a "spring cleaning once a year to keep iOS running at top performance levels. But, I'm afraid that Spring Cleaning has to be done as a backup / restore to be 100% effective.
I also feel that when the "Other" takes up lots of space it only restricts storage capacity of media files and not speed until the "Other" gets so large, less than 1GB of space is left. When the iOS has less than 1GB free, then speed begins to deteriorate rapidly. In my wife's phone when her's got down to 1GB, I deleted all the installed apps, and deleted the cache and history in the iOS apps like Safari, and erased all emails, pictures, and videos, and pretty much everything I could think of. This freed up another 500Mb only but I still had over 11GB in the "Other"
I have a much better understanding of windows and DOS than iOS. The problem that slows down Windows, is mostly a cluttered registry file and there are tools to deal with that. I use them on a weekly basis. Also, a fragmented hard drive can cause slow down. But defragging a hard drive is a rare need for me since I have switched SSD's now. Defragging SSD's is not recommended and can shorten the life of the drive. Instead, a better way is to copy all files to another drive and reformat the SSD. Then copy the files back to the SSD which will then lay the files to the drive in a contiguous sequence.
Until Apple offers up an OS procedure to deal with "Other" I will plan to do the backup/restore lengthy procedure as necessary. Most likely, we will be upgrading my wife's iphone 5 to the current model next summer when her upgrade deal is available. For now, her phone is running like a brand new phone and we're happy. I'm just disappointed in that this issue appears to be a design flaw in the OS that Apple chooses to keep.