So I tried to make a spider farm in creative, so I tried using a spawner and after that I wanted to remove it. So I wrote /fill x1 y1 z1 x2 y2 z2 air and after that the spawner disappeared of course but the particles was there until I reloged to the game, F3+A didn't help, placing a block didn't work, nothing worked. the spawner's particles stayed there...