Digital BW, The Print

I have been using Lyson Small Gamut inks on my 1270, and would like to
switch over to MIS FS.  I found the following on inkjetart.com:


>The only time you really need to use a cleaning cartridge when switching to MIS
>Archival Ink, is when you have been using one of the non-compatible inks in
>your printer, like Luminos, Lyson, Elford, or Jon Cone's Piezography. These
>inks have an acidic pH and will form sludge or particles if mixed with Epson or
>MIS ink. This can definitely damage your printer and cause permanent banding. A
>cleaning cartridge neutralizes the acidic ink so the MIS or Epson ink can be
>used.

Is this true of the Small Gamut inks as well?  And is there a consensus
regarding this?  (I don't have cleaning cartridges for the 1270; just for my
860.)