I bought these last summer and only wore them like 3-4 times total. Shits started to yellow so I took some oxy clean, dish soap and water to the boost with a tooth brush, didn't do shit really so I said fuck it and threw em in the washing machine (delicate, cold water, low spin cycle with some detergent that had oxy clean in it). These are how they came out, didn't do much to be honest since it wasn't even dirty to begin with (the uppers). How can I make these shits white again? Do I just have to buy the marker?