If you're talking about a sewed fabric apron for a bottle of dish soap, then do a google with "apron" +for dish soap bottle as your subject and you'll find a bunch of sites with instructions. If you're meaning one that is knit or crocheted, I'd be interested to hear what they look like.

there's a pattern for one apron and two dresses at Crochet Pattern Central. Look under dish detergent and dish soap

Here is a link that might be useful: Crochet Pattern Central - kitchen