For the record, I clean my fly line (floating lines) and add dressing about once or twice a year. I wash with room temperature water with a drop or two of mild soap, usually dish soap. I let it dry and apply a coat of Glide, allow it to dry overnight and then wipe with a clean cloth as I put it back on the reel. I find that my line is not that dirty after each use so cleaning every time I fish seemed not to be necessary. However, if you fish waters with more dirt, oil etc in the surface film, cleaning more frequently is probably a good idea. It sure does make a difference in the performance of the line.

Dr Bob