Welcome to 2CarPros.
That is a very important question to ask. The vehicle windscreen washer fuse should be a 10 amp fuse. One shouldn't increase the amperage because it can allow damage to occur. If something shorts, it could allow the wiring to melt and cause a fire.
With that in mind, I recommend only using the correct fuse amperage which was indicated by the manufacturer. See the attached picture. It shows the amperage recommended.
Joe
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Saturday, April 6th, 2019 AT 9:44 PM