Something sticky has dried on the tabletop and won't come off.
「ベタベタしたものがテーブルのうえで乾いてこびりついてる」= Something sticky has dried on the tabletop and won't come off.
ボキャブラリー
べたべたしたもの = something sticky
テーブルの上 = the tabletop
乾いた = has dried on
こびりついている = won't come off (直訳:取れない)