Windshield wiper stalk problem?

[MogulBoy]

I have already replaced my 4-stalk steering column stalk switch module once about 5 years ago when the turn indicator switch broke and would no longer self-cancel.

Now the windshield wipers are acting up as follows. When I briefly nudge the stalk upwards, they used to do one full sweep and return. Now, they just move when the stalk is being nudged and they will stick wherever they are when I release it. They still work as normal if I leave them in the other three positions but I miss the ability to control them on demand (I don't have intermittent functionality).

Would I be right in assuming that the problem here is most likely to be with the stalk switch contacts and not with a relay located elsewhere or anything else?

I guess I'll need to spring for a replacement 3-stalk switch 99661321710EWC (and swap the OBC stalk) over but perhaps it's worth spraying some electrical contact spray in there to see if that revives it?