I've got only one cutting board in use, a 16 x 18 x 2 inch of end block hard wood. When new, I took a week to saturate it with mineral oil from both sides. It has now served for some 30 years with only a barely perceptual dip where nearly all the hard cutting and chopping has been done for this time.

I clean it with Comet Cleanser a few times a day.

I still have my previous cutting board, 12 x 18 x 1-1/2 inch side strip hard wood. It is used now only for photographs.

In laboratory testing, plastic cutting boards are no more sanitary than wood ones. Wood has some anti-bacterial properties, and on plastic, small cuts can close around bacteria and retain it.