Oh, that is when it reaches 99 when the multipliers throttle down to 1.5 rather than 2.2. Looking good though! Will try a vacuum cleaner, I have a powerful one. I will put the tube part of it above the fan that normally draws in the air then spray at the back vents to try and chuck the dirt up the hoover, maybe even poke it with a pin just to dislodge it a bit. Can't do it now though but will hopefully try later!