I do find a lot of things on this forum difficult to understand.
You can flush ink for as long as you like and how long will it take for an intelligent person to realise that it is not going to make any difference.
Isopropanol is what the printing industry use to clean out their printing machines, many of them costing millions of pounds. The inks are actually formulated to prevent problems in the expensive presses that printing companies own. Inkjet ink is formulated to similar specifications.
Someone mentions solvents, solvents are very use specific and there are a lot of them, so which one do you use?
An example of use specific solvent would be filling a paint scratch on cellulose paint with an epoxy paint and using a solvent to remove the epoxy that will not effect the finish on the cellulose. There are a lot of examples of this. In the printing industry isopropanol will have no effect on the inks use for digital printing. Like wise the solvent used to remove the digital print ink will not touch most other inks.
I have never tried renovate on inks and why should I, it has been formulated for a totally different purpose.
The beauty about isopropanol is that it will not attack the latex, used in the manufacture of secondary backed carpet. Also being ionic it is easy to flush.
Why even try rx it is not formulated for ink it is for red dye but not the best for that. Get some training!
A pedantic test would be to get some ink a piece of carpet, ultrapac, and lots of flushing and when you have had enough just get some isopropanol. Or you could just soak it if solvent and delaminate the carpet.
Peter