Good five minute video on how to keep your fly lines clean and working well.  I've used the Rio "Line Speed" product and it does work very well.  Some guides suggest even cleaning 2-3 times/day when on the water, although that sounds a bit much while on stream.

https://loonoutdoors.com/blogs/journal/tailgate-talks-line-care?mc_cid=8e57eec31c&mc_eid=3613ceec46