Why external floppy dont work anymore

Maybe your drive just has dirty heads. You can get small kits to clean the heads of a floppy drive. They have a thing that looks like a diskette, but it contains a white scrubby material. They usually have a small dropper bottle of methanol or iso-propanol, and you put a few drops of the alcohol on the white scrubber and the put it into the disk drive. When I do this I usually try to "open" the "disk" which forces it to spin for a while until it figures out that it can't read it. Then I simply cancel the read attempt and remove the cleaner from the drive. Then you should wait a while (say, 10 minutes) for any alcohol left on the drive's heads to evaporate off before trying to use the drive on a real diskette.

Be warned: if you do have a drive with dirty heads, that can actually scratch the diskette surface, damaging it. If that happens to the first track where the root directory and FAT table are, your diskette may NOT be able to be read at all, and you'll lose the data on it. So I got into the habit (because I use floppies rarely) of cleaning the drive before use to avoid destroying the diskette I was about to use.

No answers yet.
In my question I said= I went to someone else's house to test both external floppy drives.
I did have Both the old external floppy drive & the new external floppy
drive = Both were WORKING at someone else's house.
The device manager recognizes it at my house.
It is cleaned ..
Maybe some setting got changed?? What is wrong?
Thanks for your help anyway.