FIXED! Roomba Error 26, $0, No Parts Required

I picked up an expensive iRobot Roomba i7+ Robot Vacuum with Automatic Dirt Disposal from the sidewalk. It has the dreaded ERROR 26, which seems to plague Roomba robots and typically requires purchasing a new cleaning head module. However, I found a way to fix it in 10 minutes without any cost. The lubricant I use in the video is WD-40 White Silicon Grease. DO NOT TRY TO USE NORMAL WD-40. Skip directly to the fix here: 03:00 Subscribe for more repair content!