Golden Cheetah highlights abnormalities in power & cadence in the second by second power table, you can just over type them. I use an average from the last good data point to the next data point that looks correct. This is on a file by file basis.
WKO runs a report (think it is a report) and highlights anything 5% default? above x. This is on all rides. They are shown with the highest value spike first. You click on a ride to go to the file and it highlights the spike on the power graph, can then just change the power to the surround ‘good’ data levels. There is a youtube video on it to get a better idea of what im trying to describe.
Anyway, something on the power graph? Drag the spike down to surrounding levels. All mine have been clearly bad data spikes. Example Pettit at 60 - 65% and then a 1 second spike of 1800w followed by a period at of 1-2 second at zero before returning to the constant 'ish say 65% something like 188 watts