Squeaky Clutch Pedal

How can I cure a squeaky clutch pedal. Every time the pedal is depressed it makes the sound of a demented seagull! I have squirted WD40 on all visible moving parts under the dash board but the squeak still persists!

Probably needs a dab of grease on the end of the slave cylinder rod.

Thanks for the tip - I have a tube of silicone grease somewhere in the garage - if I can find it!

OR - maybe red rubber grease as recommended elsewhere on the forum - I have a tub of that somewhere in the garage too!