dissolved a particular deposit. It may reflect loosened particles or other material suspended in the liquid.
Nevertheless, mineral residue that has softened during a suitable cleaning treatment may become easier to remove with a gentle brush or cloth.
This is one reason soaking can sometimes be more effective than immediately scrubbing a heavily stained surface.
The important point is to assess the actual condition of the tank rather than assume that every change in appearance means the treatment has worked perfectly.
If the surface looks cleaner but deposits remain, further
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