solkig

Etymology
. Cognate of 🇨🇬,.

Adjective

 * 1) dirty, stained (soiled with diffuse (ingrained) stains)
 * 2) dingy, grimy, grubby, etc. (when sounding better as translations)
 * 3)  sordid, morally dubious
 * 1)  sordid, morally dubious
 * 1)  sordid, morally dubious

Usage notes
Dry, ingrained grime, causing discoloration/stains, is the immediate intuition, on pillow cases, wallpaper, or the like. Might rarely extend to things where "ingrained" makes less sense, hence parentheses.