SLK R172 Windscreen Washer Problems and diagnosis - Mercedes Benz SLK Forum

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#1 Old 08-28-2016
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SLK R172 Windscreen Washer Problems and diagnosis

I've recently had problems with my car's windscreen washer not working.

The car's out of warranty and I didn't fancy the potential Ł100s a dealer would charge to investigate and fix.

I'm not a mechanic by any means, but how hard could it be?
I've documented my diagnostic methods and remedial action in the attached PDF, in the hope that it may help save some other poor soul a bit of cash.

This forum's been very helpful to me over the last couple of years and this is my chance to give something back. Enjoy, you lovely, lovely people
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File Type: pdf SLK R172 Windscreen Washer Problems and diagnosis.pdf (1.62 MB, 145 views)
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#2 Old 08-29-2016
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Great detail and write up. Glad it didn't take the whole bumper to be removed! Any idea how all the gunk came into your system?
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#3 Old 08-29-2016
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Judge, I've no idea how it got there, it wasn't ever visible from the engine bay when I was topping the bottle up. I've only ever filled it with water straight from the tap (it's pretty good where I live) and about 20% screen wash.

The stuff seemed organic in its nature, but some of it coated the inside of the bottle so tenaciously that I couldn't have cleaned it properly without removing it from the car. If it was organic I didn't want to leave any remnants of it in there to start multiplying again.

I did a bit of googling and some people suggest that it may be promoted by mixing different brands of screen wash. I don't know if that's a likely explanation, I've only ever used one brand, but it's almost certainly different from what the original owner used, so it could be a possibility.
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#4 Old 08-30-2016
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Silly suggestion but maybe try boiling the water before pouring it in the bottle. Let it cool first Just might be harbouring some little nasties that don't bother us when we drink it but let to their own devices, will multiply.

Reason I suggest this as a medical procedure I have to perform on myself (get your mind out of the gutter guys ) requires distilled water (and copious amounts of it).

I boil my water for 4-5 minutes and it kills off any remaining bacteria. I've had no ill effects using boiled water instead of distilled.

It might be worth a try.
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#5 Old 08-30-2016
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Originally Posted by LeonardoDaBenz View Post
Silly suggestion but maybe try boiling the water before pouring it in the bottle. Let it cool first Just might be harbouring some little nasties that don't bother us when we drink it but let to their own devices, will multiply.

Reason I suggest this as a medical procedure I have to perform on myself (get your mind out of the gutter guys ) requires distilled water (and copious amounts of it).

I boil my water for 4-5 minutes and it kills off any remaining bacteria. I've had no ill effects using boiled water instead of distilled.

It might be worth a try.
Great idea, I'll be doing that in future.

I'd always imagined that the screen wash would include additives to kill of any nasties, but clearly not.
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