Fly line cleaner: Take care of your fly line & it will take care of you.
There's no two ways about it, fly fishing line is expensive. We all wish it wasn't, but it is. So choosing to protect your investment and take good care of your fly line is a smart move. This will make sure you don't keep having to buy a new fly line, emptying your pockets to fill your net.

Stop spending needlessly on fly line, clean up your act.
Let's get straight down to business, here's the essential steps to great fly line care:

Gather some liquid soap, two buckets of warm water & two soft cloths.

Add a few pumps of the liquid soap to one of the buckets and stir to make bubbles.

Get your fly line off the reel & place it in the bucket with soapy water.

Run one of the cloths down the line from one end to the other.

Move the line to the bucket of water without the soap & rinse well.

With the second cloth, dry off the line as you remove it from the water.

Respool the line back onto your reel.
You won't be the first to wonder why you need to clean your line.
If this seems like hard work and looks to you like a fly line doesn't seem like it should need much cleaning, you wouldn't be the first, but be warned! There are a number of crucial reasons why you should take good time to clean your fly line. It will last longer, be more buoyancy, and cast further.
You see, when you use your fly rig ongoing, even though you can't necessarily see it line will gain dirt and algae, which will ultimately weigh down your line and therefore increase the difficulty in ensuring you get a great presentation with a surface floating fly.
Your essential supply list for effective Fly Line cleaning.
When cleaning your fly line it's crucial ensure you the right products. For example the soap used should be liquid soap only. Bar soap will make a film on the line which will negatively affect performance. Dish washing liquid is abrasive and will reduce the life of your fly line.