QUOTE(V429 @ Dec 29 2018, 11:30 AM)
Just to share my experience, I finally found out why grime trail keep appearing from my car's door handle part, despite my repeated washing with brush.
It's because there is grease applied inside the handle and I usually pull it lightly to wash it with brush, so I suppose grease mixed with soapy water is what caused it to form the grime trail.
Maybe next time I should just wash the outside of the door handle.
That is one probability. The other one is that rain trails most frequent at car edges, door handles being one of them. To know for sure, try use your water hose to spray your car and see where water trails.It's because there is grease applied inside the handle and I usually pull it lightly to wash it with brush, so I suppose grease mixed with soapy water is what caused it to form the grime trail.
Maybe next time I should just wash the outside of the door handle.