Last night I received a copy of the Bulova Watchmaster WT manual and it led me to some questions about rinse procedures. The standard recipe I've seen and read about involves a first rinse cup, followed by a second rinse cup. When the first rinse cup gets dirty, you toss it, the second cup becomes the first cup and you refill the second cup with clean solution. I suppose "dirty" is subjective and is probably detected by the color.
The Watchmaster manual has two versions, a three cup rinse and a two cup rinse. The three cup rinse is similar to the above procedure, except the first rinse is a dip-only rinse and you discard the rinse solution from the dip rinse with each basket cleaned. Once discarded, you place rinse two into the dip rinse, rinse three becomes rinse two and rinse three gets a clean fill.
The other version is a two rinse cycle similar to the standard recipe, except they recommend you discard all solutions with each basket.
Each of these seems to be a little overkill, in light of the standard recipe and because I'm not cleaning six watches at once.
What are your thoughts on this? I have three ultrasonic cups and the spare cup, so I can do a three rinse version, but hate to expend six ounces of rinse on a single watch if it's not necessary. I'm thinking it's safe to rinse six watches before cycling the solutions.
Also, when discarding, I was thinking about putting the waste solutions into an open paint can and just letting it evaporate. Years ago I handled ESH for a company and the county ARB suggested that as the best way to discard small amounts of solvent.
Another thought is to light the BBQ with it, at least the rinse.