u/Prudent_Invite_7074

I’m trying to clean my cement greys and make them look fresh out of the box. The other shoe is clean but the left pair has dirt that is stubborn and won’t come off. I tried scrubbing hard with soap, water, and brush. i can use a toothpick but it will take a while. It is really hard to get rid on the icy part. I’m literally about to give up, please help me or give me suggestions on how I can take out this dirt. Thank you in advance.