Check if the white spots are well defined square pixels on the screen. If they are then you may have pixel failure.
If you believe it's dirt then disconnect from the power and undo the screws underneath the unit. lift the cover over the front of the machine and carefully remove the pcb to get at the optics. don't touch and glass bits with your bare fingers. clean the optics bits as necessary with a camera dust blower bellows. best of luck.
Considering everything that we might step in during the day, it's a wonder that we bring our shoes into our homes at all. Cleaning our shoes not only gets all that grime back out the door, but it makes the shoes look better and last longe
Instructions
Things You'll Need:
Clean smooth leather shoes by first removing the laces and giving them a vigorous brushing with a shoe brush.
Clean salt stains from shoes by mixing equal parts white vinegar and water and dampening a small cloth. Use the cloth to scrub the stained area. For suede or nubuck, use a nylon bristle brush.
Use leather cleaner or saddle soap to clean the leather with a soft cloth. Pay particular attention to the seams.
Clean suede or nubuck with a pencil eraser or fine sandpaper, then rub with a bath towel to bring up the nap again.
Apply leather conditioner to all leather shoes, taking care to use the correct kind for smooth leather or suede. Conditioner keeps your shoe leather soft.
Waterproof your shoes.
Polish your shoes to help protect them and to give them a clean-looking gloss.
Deodorize your shoes by sprinkling a generous amount of baking soda into them and shaking the shoes to distribute it inside. Let stand overnight, and then shake the baking soda out
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