It wouldn't on the m6 where I tend to use screenwash so I'll stick to this cheers
I find that a bottle of mr muscle glass cleaner a rag and some elbow grease works quite well.
If that works for you great, I personally find the cheap stuff doesn't clean as well as this so it's worth the bit extra IMO
I’ve never thought of improving my screenwash. I think I will make do with the £2 for 5 litre stuff..
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