The easiest thing I did was go to MyFiles/Android/Data/.com.android.providers.media/albumthumbs and delete all the files inside. This did not compromise the system default thumbs or the thumbs that actually downloaded with the album but all the random ones from other files or my personal pics were removed. Hope this helps.
this works thanks Jazzy_Blondy1. Of course player will chose a new album art. Mine was like "00..." it picked a new one with "v...". Consider this.