In uk.d-i-y, dave @ stejonda wrote:

Just got back from the shop - Finish are now selling Protector which
'releases glass protecting agents that neutralise the damaging corrosive
elements'. Why don't they just remove the damaging corrosive elements?

Umm, chemistry.

When you wash dishes by hand, you have an intelligent system which directs
mechanical scrubbing action at the particularly dirty bits. Until the
advent of nanobots ;-) no dishwasher-and-powder combination can do this;
so, to compensate for the absence of a direct mechanical scrubbing action,
the water temperature is noticeably higher than for handwashing (if
you ever dunk your hands into 65-degs-C water you'll know about it!!), the
dishwasher detergent is markedly more aggressive than what you'd use in the
sink, and the washing cycle goes on for a damn sight longer than any
normal ooman bean is willing to put in at the sink - maybe 20+ minutes
sustained washing time. Without the "aggressive" and mildly caustic
washing powder, your dirtier plates and pans just aren't going to come
out clean - and remember the woshdosh has to subject all the contents to
enough cleaning for 'worst case' (with a crude separation between top and
bottom racks which reduces the pressure, and possibly volume, of the
dissolved cleaning-gunk sprayed at the top rack by comparison with the
bottom).

HTH - Stefek