[Minty]

IIRC, I took the steering wheel off & was faced with a near-circular metal plate, screwed on, which the stalks are immediately behind. I sprayed WD40 (viewing it as similar to contact cleaner) and flicked the stalks on/off several times. If you can see the bases of the stalks now then you could probably do the same without removing the wheel.

Be very careful if you decide to remove the metal plate to take the stalks off altogether - the indicator has a spring-loaded assembly for cancelling, I broke the little post the spring works against because the plastic had gone brittle.