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1/16th scale Fillable Windshield Washer tank for RC Car/truck
Separate the tank and the cap and trim away any excess parts from both.
Fill it with glass cleaner or actual Washer fluid and glue the cap on with a little contact cement (other glues might prevent you from reopening it should you need to refill) and bam, you have yourself a realistic scale washer fluid resevoir.
It needs to be printed in this "Frosted" Fine Detail plastic in order to be able to see the liquid inside.