I was simply providing a link to show that there is a leak detection dye available and it was not exorbitantly priced. It is actually available from several retail sources. We used to be able to get it on a day's special order where I worked but we did not stock it. I was not providing any leak detection instructions.
Whether dye is going to help one find a leak or not really depends on a lot of factors and, IMHO, if the source of the leak is not obvious then calling in a leak detection company might be a good idea.