The Texas Metal Works’ blog has an article specifically addressing long-term care of any steel table.
#tldr version:
- If the table has rust that needs to be cleaned, a cheap burnishing tool works great.
- WD-40 periodically sprayed on the surface will completely prevent rust.
- OSPHO treatment on the surface will protect for up to a year.
- Weld-Kleen 350 prevents spatter from sticking and has a rust preventative agent.