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<p>[QUOTE=&quot;rlm&#039;s cents, post: 614901, member: 7957&quot;]Water is incompressible and therefore at a fixed density.&nbsp; It does not change.&nbsp; However, it is like tornadoes driving straw into trees (they really do).&nbsp; Things do strange things when they have a lot of momentum.</p><p><br /></p><p>I am not sure what pressures remove what.&nbsp; However, I would be pretty sure 50 psi. would do little.&nbsp; My city water pressure is 70 - 90 psi.&nbsp; Home units use a couple hundred psi. and do a good job cleaning dirt from concrete.&nbsp; We used to clean plastic gum (about the worst gunk the operators had seen) from reactors at about 1200 psi.&nbsp; I would think verdigris would be similar to the dirt side.</p><p><br /></p><p>As an aside to this, all the info I have is at several inches to 2 feet from the items to be cleaned.&nbsp; How close would you want coins?[/QUOTE]</p><p><br /></p>

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