also diluted about 1:4...honestly, I don't measure it. I just our it in and have at it. Vinegar will not harm you tank per se, but a good rinse is adequate. I just rinse it out and be done with it.
Muriatic on the other hand, is much more of an issue, but it does a sweet job if you are in a hurry. Because most skimmers are so big, I would just use a rubbermaid, pour a gallon of vinegar in and fill with water. then place the skimmer in it for a day, and flip it over for a second day.