Painted the dirty boost with a Sharpie oil based paint marker bought from hobby lobby. Was about $5. My hand wasn't exactly steady but for the most part it worked well. :
HOW TO MAKE ADIDAS BOOST WHITE AGAIN | Sharpie Oil Based Pen - YouTube
UltraBoost Restoration with Oil Based Sharpie - YouTube
HOW TO BLACKOUT ADIDAS BOOST W/ $6 SHARPIE?! WILL IT WORK? - YouTube