Reddit mentions of Ebonite Heavy Duty Shoe Brush

a wire brush, like this.

You don't necessarily have to slide all the way from the dots to the foul line, but fronm a fellow ex-planter here is some advice:

• First off, it doesn't look like you're using house shoes, so make sure and take care of your shoes. Invest in a wire brush to keep up the slide sole example
  
• Make sure you can slide at all - standing on the approach, try to slide with your left foot. Keep your weight more towards the toes. If you can't slide this way, your sole may be dirty or the center may have really tacky approaches. In that case...
  
• Try a slide sock (I can't tell a difference between brands, I've used these, Storm and Ebonite).
  
• Once you're comfortable sliding, try some One-step drills without the ball, then with the ball.
  
• And, finally, once you get comfortable with doing that, keeping balance, try an entire (slow) approach to work it in.
  
  I don't think you have a "slow" approach, necessarily, but you do seem to take a big pause between 3rd and 4th step to let your body catch up since your pushaway isn't happening in sync with your second step. In fact, one drill my coach had me do at my first lesson (which felt like a real waste of money) was to step left, then hinge the ball down in along with my second step several times in a row.
  
  Once you can burn that into muscle memory, you won't have to think about it anymore.
  
  Anyway, TL:DR - keep your weight forward (torso bent forward over knee, weight (mostly) on left toes and try and keep the knee bent to get into a slide.
  
  (/u/akimbojimbo229)