"John Scheldroup" wrote in message
...

To All:

On a scale of 1-4 with "1" the most corrosive and
"4" least corrosive, rate the following ?

Synthetic fluids
Water-soluble oils
Semi-synthetic fluids
Cascade


This is a false comparison. Automatic dishwasher detergent, like Cascade,
contains Sodium Hypochlorite Sodium Silicate which is corrosive to aluminum
and can even etch glass, but AFAIK, has little effect on most common
plastics. On the other hand, there are plenty of solvents that do nothing to
metals, yet will quickly dissolve many plastics.

Try this: mix up a concentrated solution of Cascade and water and soak a
piece of PVC pipe in it. Now try soaking that same PVC in a bath of
methylene chloride. Next, try the same experiment with a piece of aluminum.

- Michael