Windscreen Wipers

Clio MK3 - Windscreen wipers have stopped working. They have gradually got slower, and now hardly move up the screen.

Stripped the car last night to take a look, not too much debris under the scuttle panel at all.

Essentially the wiper mechanism looks fine, the splines are greased and the circlip's are in place.

The motor is getting power and when switched on around every 60 seconds the mechanism moves slightly.

Debating which parts to replace first, any ideas?

Cheers
JAM
 
should of just dropped the wiper motor spindle arm off and see whats free to turn or not