Hi, I had the same issue if flash went off otherwise would take perfect pics in daylight as my flash wont flash in bright light conditions, guess it depends on the phone brand but today I popped off the cover over the cam lens and flash with finger nail to see the led was easy to slide out of its bracket. this is on my Nokia C5-00, an older phone. i put a thin piece of plastic cut from a zip lock bag over the contacts then inserted the led and cover. no more wash out and no more flash. flash wasn't very strong anyway. (if you do this make sure the led goes back the same way.) They should have had a black foam rubber seal between led and case. before I could see the flash through the usb hole, light bounces all around in that area of case. (Removing the plastic film over lens did nothing for me). Hope this helps?
PS. There's no way for me to know which other cameras this will solve the wash issue with, might be something else with your cam? When I think i want a flash I'l get some black foam rubber and see if i can isolate the flash but probably not worth the time as my single led flash is only effective for a short distance. At least its not like viewing a picture through a Fog now. 🙂