Available at a chemist near u....
Steps:
1) remove screw in grease injection port in side of pedal body
2) put desired lubricant in syringe
3) inject lubricant until old lubricant is expelled from crank side of pedal body
4) wipe off old lubricant and replace injection port screw
Refer to pics & video below....







Edit:
The video doesn't want to embed so I'll upload to YouTube shortly....