Mike,
Do you know the exact name of fluid that you used? Also, what steps did you do?
I only ask these questions because you used the word "solvent" above. If you truly did use a solvent-based cleaning fluid, they the print head is probably done. However, there are many different types of cleaning fluid - but you want a waterbased cleaning fluid for an 1800. I am sure if you got it from Conde, then it would be the correct fluid.
As for why it is not printing, one of the reasons this has happen with
dtg printers is the person goes crazy cleaning the capping station and actually gets the ribbon cable that connects to the print head wet. This is why I asked what exactly you do with the fluid.
This information might help us narrow down the potential solutions to your problem. Hope you figure it out. Best wishes,
Mark