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Rinsing he eye with clean water would only help if there was a piece of lint in the eye which would have caused a foreign body sensation. Since you do not have any such sensation, it is likely that the thread like floater is actually due to age related changes in the eye.
Vitreous is a thick gel in the back of the eye which shows age related changes resulting in symptoms of floaters or wavy lines or patterns with or without flashes. However this requires a routine dilated eye exam by an ophthalmologist.