washes, why you use what you do?

For panel lines and all I prefer acrylics like Createx which is made for T-shirt airbrushing.

I mix it with water to thin it and a drop or two of Dawn to break the surface tension and wipe it into the panel lines. It is easy to remove being that it does not adhere that well to plastic. Then I wipe off the excess with a cotton swab moistened with a little water and use a piece of paper towel to wipe off any other remaining paint.

Works great for me.