The really low end slides use a stationary roller, which might limit the grease exposure, but they don't extend fully and they're not at all heavy duty (plus they're prone to letting the drawer fall out if pulled to hard or too far). I think if you need full extension you're stuck with the telescoping rails, which means open bearings. A quick google search pulls up lots of dry lubricants that purport to work on open bearings, though they usually illustrate with radial bearings. I'd get a set of full extension slides, wash out the grease and try some of the dry stuff, just to see how it works. Maintaining the slides in situ for the future could be problematic--I imagine you have to apply it more often than grease and it's usually aerosol so that could mean extra work to protect the contents.