As you might imagine .. we get trucking loads of bugs down here in Sunny Spain at certain times of the season .. including some really big fat barstewards that can cover your line of sight in one enormous splatter
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Whenever I can .. I use the same method as Chilly and Hodge (see above) when I do a Rolling Pit Stop, loo, visor, drink, food, fuel and whatever .. and then again once I land back at base.
Wet paper towel over visor, soak for five minutes, lift and wipe, polish with second dry towel .. no damage, roll on
Stay Safe
Polar Bear