it has to be fairy liquid, - and the old standard stuff not the poofey purple "essence of wild elderberry" or the like. However you are leaving a film of the stuff so your vision is not so perfect, like the double glaze effect you get with fog city.
My advise, my a Shark RSR where the respro style mask is built in, - this is the only helmet that has helped my misting issues, and I get them due to hayfever, and never breathing easily on a bike. - I can even keep sneezes off of the inside of my visor now! -
