Nothing... I used soaked the windshield and then used a wet wash not to barely clean the hard coat Honda windshield I had for my Valkyrie. Scratched so bad I had to replace it because I could see nothing when the sun hit it, I had to start using a cleaner specifically designed for cleaning a hard coat windshield. Then spray it off then wash it with water. Got to the point I just rode without it.
Glass is heavy and expensive but if you want a wiper it’s your only real choice.
That said a wiper is awesome! I even put a washer tank on mine. Used it last Sat, it was dusty and muddy for a few hours and warm (mid 70’s) then it came a downpour and it was much cooler (upper 40’s) muddy and raining. It was nice to be able to clean the mud spray and chunks off.
1000
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700
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I went through a 3 gallons of water cleaning the windshield that weekend and it was raining for a day and a half. You will use it more than you think.
Can’t use rain-x on a plastic windshield either.