Windscreen wiper for your helmet

Saw this on Facebook and to say the least, I am extremely skeptical about it. 

RainPal

Half the stuff they state on the website is pure crap. But they're selling them even though they don't have a working prototype. So many design flaws. I can't help thinking "scam".

Think I'd prefer to just get one of these for 1/50 of the price.

If it were a wiper for a bike mounted screen it might be a different matter as that's further from your eyes so would block your vision less.

It would be *possible* to make such a thing; I don't know if they have, not really sure I want to spend 50 quid to find out. If they were really serious about it they would make a website that didn't actively put people off reading it...

Anyway:

These work:

http://www.getgeared.co.uk/bob-heath-finger-glove-rain-visor-wiper-black

This helps:

http://www.amazon.co.uk/Nikwax-Visor-Proof-125ml/dp/B001MQ01QE

(you might be able to get both of these cheaper than my links)