Neither Nice, Nor Mean

Riddle: I can be your best friend, or your worst enemy. I can make you clean or filthy. You can ride on me, or I can glide on you. Sharp I am mean, dull I am cruel. What am I?

Answer: A Razor. (Razor is also a brand of scooters). Source: https://riddles.com/index.php/6822

I can be your best friend, or your worst enemy. I can make you clean or filthy. You can ride on me, or I can glide on you. Sharp I am mean, dull I am cruel. What am I? — Neither nice, nor mean by JNutt22 Riddle