Ride, Wrench, Swap, Race
Join Date: Jan 2010
Location: Northern California
Posts: 9,193
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
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You really want to be using a very specific type of "solvent" in these things.
Simple Green is not made for this application.
First of all, the chemistry will definitely change over time, until you have who-knows-what kind of corrosion and biological growth and odors/gasses going on!!!
The commercial parts washer fluids are designed to maintain stable chemistry to best effect over the longest replacement interval.
So when the time comes, you trade in the old fluid for new. Maybe once or twice a year for a home washer like this one.