RAC tells drivers to use 1 ingredient to thaw frozen washer fluid - The Mirror

As temperatures plummet, many motorists are dealing with frozen windscreen washer fluid in the cold weather, but experts at the RAC (Royal Automobile Club) say a certain ingredient can help

Katie-Ann Gupwell

11:19, 09 Jan 2026Updated 11:20, 09 Jan 2026

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As the UK experiences a drop in temperatures, icy mornings have become a common sight, leading to cars freezing up. But it's not just windscreens and doors that are affected, as your washer fluid might be freezing too, but it's a problem that can easily be solved with some simple advice.

Screenwash, essential for removing dirt and grime from car windscreens, can easily freeze in cold weather; however, the Royal Automobile Club (RAC) has suggested a simple solution to this problem. This isn't the only handy driving tip being shared recently either.

Just a few days ago, expert advice was given on how to quickly de-ice car doors in the morning. You just need to use a surprising trick to get the job done.

The issue of frozen wiper fluid was raised on Reddit by a new driver, who asked: "How the hell do you deal with frozen wiper fluid? New driver here.

"In this weather, my wiper fluid never seems to thaw out enough to work properly, which is made worse by the gritted roads splashing dirt on my windscreen. Not sure if I'm just dumb, or doing something wrong here? Any advice appreciated."

One respondent offered some advice, saying: "So, whilst you may well need to use a better/more concentrated screenwash, you also might find that the nozzles freeze regardless. Lots of modern/high spec cars have heated nozzles for this reason."

They added a practical tip: "Sort the fluid out and, if it still happens, try to defrost the nozzles a bit. E.g. pour hot water over them."

Another person suggested: "Use winter spec fluid." However, the RAC has clarified that motorists only require one key ingredient to tackle the problem effectively.

What does the RAC say?

The motoring organisation explains: "Screenwash helps keep your windscreen clear but, when the mercury falls, it's vital you use a quality screenwash that is effective down to -20C. Top up your filler bottle with neat solution.

"Don't try and dilute it, and steer clear of ready mixed screenwash that won't give you the protection you need. If the screenwash bottle is already frozen, you can try adding hot (but not boiling) water directly into it to thaw the solution.

"If the washer jets have frozen, you'll just need to wait for the engine to warm enough to thaw them again. So always make sure you can clear your windscreen with other means before you set off. Remember the golden rule. Never use hot water to de-ice a windscreen."

How to thaw frozen washer fluid

When using water to defrost frozen washer fluid, it's crucial to use lukewarm rather than boiling water. Motorists should pour it into the reservoir and onto the nozzles to assist the thawing process.

Several alternative methods have also been recommended. Simply relocating the vehicle to a heated car park or garage for several hours can allow natural thawing if time permits.

For those with access to a garage, increased winter usage is advisable. Additionally, some motorists have found success using a hairdryer to tackle the issue.

Connect it using an extension cord and gently blow hot air over the reservoir and visible hoses. However, it's crucial to keep the dryer moving as there is a risk this method can melt the plastic, so exercise extreme caution.

The RAC further advises: "Hopefully you will now know what to do if ice is impacting your vehicle. However, should you need further assistance, we have a range of winter driving guides that can help you get back out on the roads safely."