Just shake it and follow the next steps. You can clean it with White Spirit or even thin it for other purposes like washes.
1) After paint the white base color and paint other effects like chips or washes apply our Winter Streaking Grime. This tone work well over white color but we don’t recomend you over other different colors. Now paint different random vertical lines with a fine brush.
2) After the lines is dry (around 5 or 10 minutes) dab the lines with a clean brush and White Spirit.
3) Do not over do the dabbing or you will remove all Streaking Lines.