Digital BW, The Print

I need to store my printers (R2200, R2400) for six months or more and I 
was wondering what the best method is. I live in an exceptionally dry 
climate. Relative humidity can be 20% or lower quite regularly in the 
winter. Unless I am printing regularly, my printers require at least 
one and usually two cleaning cycles per week. I could take the 
cartridges out, but I am worried about the ink left in the head. will 
dry out and form a plug.

I was thinking of putting cleaning cartridges in, running a few flush 
cycles and either leaving the cleaning cartridges in or taking them 
out. I am unsure whether leaving the cleaning solution in for an 
extended period of time would hurt the printer or not.

Thank you for your suggestions.

Paul G.