Don't let my secret out but I use Dishwasher rinse aid in mine and it works very well. Maybe 25ml per litre of water.
__________________
Don't take life too seriously.... No one gets out alive
KIA Sorento CRDi EX ( Ebony black) with 5 hex chrome plated tire air valve covers, Coramal Sunsheild, Elcheapo GPS, First Aid Kit, full KIA toolkit & Yellow lenses on the Foglights......
hi elliemike. my wife used to mix up a brew,for the washers on my truck. per litre = 200 mils of metho spirits,a couple of squirts of dishwasher detergent,then fill the bottle with water. it worked a treat.