XB1- Hold LB + RB + B and push up on your left stick, once you start going faster than operating speed you can let off the B button, but you must keep the LB + RB held in the whole time while pushing up on the left stick while you're working.
PS4 would be L1 + R1 + Circle and up on the left stick, CAN NOT CONFIRM that it still works on PS4 though.
Sprayer speed
Re: Sprayer speed
Thanks! I will have to try it out later.