What is this cack?

[hunt_the_fox]

Just bought a L405 RR second hand from a main dealer and I've had it a couple of days. It has been great until I use the wiper wash. It comes out as a liquid but that liquid quickly dries to a weird crystalline cack that fogs up the windscreen. When it dries it looks most odd and makes it almost undrivable as the only solution to clear it is to use more washer that clears it in the short term but makes it worse long term. Any 8deas what it is and most importantly how to get rid of it?!

[Louis Balfour]

hunt_the_fox said:

Just bought a L405 RR second hand from a main dealer and I've had it a couple of days. It has been great until I use the wiper wash. It comes out as a liquid but that liquid quickly dries to a weird crystalline cack that fogs up the windscreen. When it dries it looks most odd and makes it almost undrivable as the only solution to clear it is to use more washer that clears it in the short term but makes it worse long term. Any 8deas what it is and most importantly how to get rid of it?!

Ectoplasm. You need the services of a priest, who will say prayers into your washer bottle.

[Chedders]

Sort of looks like Adblue

[swisstoni]

Louis Balfour said:

hunt_the_fox said:

Just bought a L405 RR second hand from a main dealer and I've had it a couple of days. It has been great until I use the wiper wash. It comes out as a liquid but that liquid quickly dries to a weird crystalline cack that fogs up the windscreen. When it dries it looks most odd and makes it almost undrivable as the only solution to clear it is to use more washer that clears it in the short term but makes it worse long term. Any 8deas what it is and most importantly how to get rid of it?!

Ectoplasm. You need the services of a priest, who will say prayers into your washer bottle.

I’d get him to bless the whole car while he’s there.
And see if he does a warranty.

[catfood12]

Chedders said:

Sort of looks like Adblue

I was going to say that. I spilt Ad-Blue down the side of a car whilst filling up, and it looked just like that. Does it smell funny, like of urea OP?

[Ohnoayellowone]

Pretty sure it’s adblue. Someone’s filled the washer bottle with it by mistake would be my guess.

[Mr.Chips]

Just watch it doesn’t damage the paintwork.

[ziggy328]

Looks like ad blue to me too. Or someone’s been dogging 😂

[Darumvej]

Just hope they havn't put the washer fluid in the adblue reservoir.

[Pistonheader101]

Darumvej said:

Just hope they havn't put the washer fluid in the adblue reservoir.

wouldn't be suprised....

[Pica-Pica]

Ohnoayellowone said:

Pretty sure it’s adblue. Someone’s filled the washer bottle with it by mistake would be my guess.

Just because the washer fluid lid is blue is doesn’t mean you add blue !

(I thought I’d seen everything)

[joropug]

Yup definitely a vote for adblue too - the caps are always crusty and look like that

[joshcowin]

I know someone who filled up their addblue system with engine oil. Brand new van aswell!

[Panamax]

Screenwash can jellify over time.

Whether its old screenwash or adblue,

• Boil kettle and allow to cool a bit
• Pour into windscreen washer reservoir (allow to overflow but keep pouring)
• Let it sit for while
• Pull the screen wash lever (or whatever) and pump the whole lot through the system
• Fill gain with fresh water - pump the whole lot through to flush the system
• Refill with proper screenwash mix and congratulate yourself on a good job done.

[hunt_the_fox]

Thank you I have done this. It took a while!