You might be able to clean them.
I'd remove all the gas you can from the tank and lines, replace the filter. Add some thin solvent like acetone or something. Remove the FPR or any connection so that you can use the fuel pump to move the solvent thru the system. If you can pump the solvent from the tank to the injectors, do that until it's clean. Check if there is an in tank filter as well.
Once you have the tank/lines flushed, remove the plugs and crank the engine on/off to force the solvent towards the injectors. See if you can get the solvent to pass thru the injectors as it could flush out whatever is in there.
I've seen injectors that have filters at the top of them, check if yours do. Once the solvent is in the injectors, I'd stop cranking for a while and let it break things down. Then come back in an hour or so and crank it some more.
After a few runs of this, put the plugs back in and see how she runs with fresh gas.
Pick the solvent that mixes with gas, I'm not sure which ones do, but some are just like octane boosters.
Don't leave the solvent in there alone for too long, as the tubes probably aren't made for it, but I'd guess a few hours wouldn't hurt.
Another option is to remove the injectors and soak them. I've seen where some have made a pump and applied voltage to the injectors to flush them out.
Maybe some local shop can do that as a service.