Originally Posted by Sev
Water and dish detergent (liquid kind) gently rub in with finger tips allow ad sspots to soak. You shouldn't be in a rush.
Fairy Liquid if you have that.
It's also the best fog preventer I've found apart from a pin lock insert. Smear it on the inside of your visor (or glasses if you wear them), allow it to dry, then polish off. One application works for about a week of commuting in the rain.
Another tip - if you use a pinlock and need to remove that from the visor to wash it, after it's dry put it in a sealed plastic bag along with the visor and a sachet of silica gel and leave it overnight. The silica gel absorbs any remaining moisture so that when you refit the pin lock both it and the visor are bone dry.