For years, I have been using cans of spray paint. For scrolling, I use the blue painters tape & 3M adhesive method. I wear protective goggles to keep the spray from coming back and getting on my plastic lenses eyeglasses.
Occasionally, some un-named idiot will forget to put on the goggles. If so, take an old toothbrush and toothpaste & scrub the lenses. Works great !!!!!!!!
jerry