On Sun, 29 Jun 2014 11:43:28 -0400, "Steven L."
wrote:

The interior of the wooden cabinet under my kitchen sink has gotten
pretty dirty; stained too. The interior is unfinished plywood, I think.


....sure it isn't particle board? (Photo w/link back here)

What's the best way to clean the inside and perhaps remove some of the
stains as well?

Are the stains from water? Particle board will swell and chip away.