I'm not familiar with "thrust washout" & I haven't seen it mentioned in any Airbus manuals thus far. I can only guess you might be referring to thrust reduction at the end of the takeoff???
if you takeoff with reduced climb, as the rate of climb decreases the thrust will increase until you have actually reached max climb thrust, so the reduced thrust was washed out. As an airline you can also set the altitude that you want reduced climb thrust to be washed out.
Mutt