Vintage Synth Repair

I just started cleaning of my Yamaha Clavinova P500 after 18 years.  
It needs complete disassembling of weighted keys. I just have  
mentioned white creamy lubrication grease used on some friction spots  
and joints. Because I want to clean the keys well, this has to go  
away and I have to put there something similar.

I wanted to ask here if by chance somebody knows what is it, or which  
substitution would be good and work without problems. I use the  
instrument only in my studio, and here in middle Japan we have hot  
(up to 42 C) and humid summers. So i suppose grease should work well  
under such conditions and not flow away.

Thanks for advice in advance, and Happy New Year to all here!

Daniel Forro