START with SIMPLE GREEN.
For Old Plastics and Bakelite, I keep Mineral Oil available.
Refurbishing the Teletype model 15
https://www.aetherltd.com/refurbishing15.html
Teletype model 33 Wiki
https://wiki.theretrowagon.com/wiki/Teletype_Model_33
Wayne Durkee, WB1FDW in Vermont is good Teletype 32/33 Resource
He still repairs them !
https://www.qrz.com/db/KB1FDW
greg, w9gb