How do i clean the blades on my lasko fan?

A tower fan should not be opened at all. (It’s unsafe to do so, and may damage your fan.) Every two to three weeks, simply use the brush attachment of your vacuum cleaner on the tower fan intake grills to remove lint and dirt, or use a can of compressed air to blow off dust from inner fan blades. That’s it! Your clean tower fan is ready to be plugged back in and get back to keeping your home breezy.

Source:
https://www.lasko.com/periodic-cleaning-keeps-electric-fans-operating-at-their-best/

Kevin-
LASKO's typically have latches or clips that hold the front fan guard to the back fan guard.
Flip latches or carefully remove the plastic clips. This will reveal the 'nut' that secures the fan 'blade assembly'. Note, the nut has 'lefthand' thread so to remove it, turn it clockwise to remove.
The fan blade assembly can be pulled / wiggled free.
The fan blade assembly can be washed with water / wiped with a cloth.
Another nut (righthand thread) secures the back half of the fan guard, remove it and remove the guard.
That should do it.

You can blow the whole fan clean with compressed air or a compressor. It does not require removing the cover. The cover comes off with a twist and a pull, but does not stay on well afterwards, so I don't recommend removal. Farmerbear at FixYa.com

Do you have the still have the e20739 lasko fan, i need the plastic blade on the unit

Buy a new one.

How do I clean my Cyclone or Air Companion™?
Lay the fan face up on a flat surface. The front grill should be facing you. Remove the screws from the rear grill. Place a flat-head screwdriver into the gap between the front and rear grills. Pull the front grill towards you, exposing the fan blade. Do not remove the knobs on either side. Then, wipe the blade with a soft, damp cloth. Use a mild detergent if necessary. Be sure not to touch the motor. Click here to download product instruction sheet.

You can call by phone Lasko customer Service and Replacement Parts......1-800-233-0268.......givi them FAN info and they will ship you part..........................Also check, your product may be covered under WARRENTY or may be listed under product recall .......either will reduce your COST .....

not sure of the lasko brand but some fans have a cap over the center of the blades that must be unscrewed to remove the blades.( the motor shaft has threads on the end of it ).
some older models actually have the blades that unscrew opposite of turning direction, and you have to find a way to grip the motor shaft and unscrew the blades........
hope this helps.............jay

On the back of the fan there are 6 recessed phillips head screws around the circumfrence of the fan. You must use a longer screwdriver as the screws are set in a couple of inches.

The two screws on the bottom are a little harder to see.

There are also two clips on the sides front cover. Squeeze on the sides gently to release these.

Try a can of compressed air. It's impossible to get inside.