Blocked Nozzles...

I have an Epson Stylus C40 Plus ink jet printer which has been left for rather a long time without cartridges in it. This has allowed the printing nozzles to become blocked and now it doesn't work.
Is there any way of cleaning it out (what sort of solvent do they use in inks?), or should I just take it to the tip?
Is there any way of cleaning it out (what sort of solvent do they use in inks?), or should I just take it to the tip?