I 'lift' them off the glass often (whenever fueling up, checking oil, etc) and lay them down square to the glass so as to not have them bend
Bending long term & baked by the sun/heat sets them ant an angle and will shudder going against the grain so to speak
Try most new ones and always go back to refill type where you pull out the rubber squeeze & SS stiffening rods. Buy 'cut to fit' refills and replace often.
HATE shuddering wiper blades.
Some of the newer vehicles has a 'park'm straight' function. When the wiper system is turned off...they stop and backup a tiny bit to park them straight to the glass
Best washer fluid is 303 tablets to mix my own (and on trips, dry tablets and use fueling station water) and use an old laundry jug with a spigot. Make about 2.5 gallons and the no-spill jug-spigot works on all of my vehicles
Laid down on fender to not have to hold several pounds trying to aim it centered to the washer jug fill tube
Gotta loosen the other end to allow makup air to allow good flow
-Ben
Picture of my rig1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...