I'm not sure what others do, but I spray silicone spray onto the plastic surface of my extension table. If the surface of my machine needs to be more slippery, I spray it onto a paper towel and wipe it on. I am somewhat reluctant to spray it right onto the machine as the machines have become so computerized and some can be persnikety.
A word of caution. Silicone spray makes things very slippery. DO NOT get it on the floor or you may end up on your keister. If you get it on the floor wash it off and wash it off well. I do speak from experience on this point.
The silicone spray that I use I got at Home Depot, and it is used for many lubricating jobs around the home.
Hope that helps.