what is the surface ?
And what kind of dirt do you have ?

I find that mostly I just wipe the dust off :-) And occasionally leaves that blow through the windows facing the printers.

For everything else a quick wipe with a sheet of kitchen paper dampened with acetone is all I've ever used.
Given how fast it evaporates and how little you need - it's just not there long enough to damage even a susceptible print surface.

Not sure how a print bed can get really greasy or dirty ?
What are you guys doing to them ?