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Hand vacuum? If its just the powder the vacuum should suck it all up. Lol this will be a reminder to me to not mix supplements in my car although I do it quite often.
I would use windex and spray the windex on the micro fiber rag so you don't wet the speaker and use a tooth brush or vacuum bristle head. Worked for me but took a little bit of time.
Have you tried just wiping it with a damp microfiber cloth? That takes out 95% of things in my car, and especially works well on the hard plastic pieces.
please do not use any water or liquid cleaner! it will turn that powder supplement into gunk!!! vacuum it away. if you have the carpet brush vacuum attachment, that will work best
U sure it wasn't Coke? Haha I spilled pwo many times in my car. I usually have meguiars quick detailer wipes on hand. A strong vaccumm should be able to get it if not. Last resort would be an all purpose cleaner. Check out detailed image.com for detailing supplies. We also have a detailing section here.
Take off the door panel and spray it from inside out with probably just water or you can use a brush to agitate it
I second this if the hand vacuum doesn't work. The door panel is really easy to remove. It's only a few screws and a handful of plastic clips, but you do have to use a plastic pry tool to pop off the plastic screw cover by the inside door handle. Also, be prepared to unplug two cables once the door panel is off to allow you to fully detach it from the car.