I have a shop, as well, and am certified in mobile and stationary refrigeration, so am am not exactly without experience in dealing with people"s AC problems and dye messes.
You are right in that it doesn"t take much dye, but it seems there are quite a few others out there who did not get the memo on that. I"ve dealt with some horrible messes.
The fact remains that oil circulates with the refrigerant, and any equipment that operates where"s there"s any amount of dust at all will show oil/stuck-on dust at the site of any leak, just as the dye leaves a residue that"s viewable under IV.
That"s a real good place to start... look in the compressor seal area and at all fittings and along the hoses for traces of oil/ stuck-on dust.
That won"t solve some awkward little leaks, but it sure finds the majority of "em, and that"s all the OP may need to do... at no cost and puts no added crud in the system.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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