We had a boat before the trailer. The best thing to clean the fibreglass and remove spider poop and black streaks is non-skid deck cleaner. It worked great on the boat and now on the tt. It doesn't take off the finish, leaves a little shine, and protects. The one we use is by Starbrite. Before that the stuff we used would remove streaks but also the finish.
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6.5 lb Chihuahua (Bella)
2018 Rockwood Mini-lite 2109s
2016 Ford F150,FX4 Scab,5.0 L V8,
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