There's not really any training for garbagemen. They just pick things up as they go.
Because the original Bubble Shooter game is way too hard.
Press and hold the button for a long as you can endure. You might even get on the leaderboard!
The longer you wait to reset the sign to zero, the higher your score. But don't wait too long, or someone else might reset it!
Every 108 minutes, the button must be pushed.