Designjet 5500 ink leak

Sorry to hear about the ink mess. 

The heads are probably ok.  Remove the print head cleaners and dump excess ink in a ziplock bag containing paper towels.  The foam may be swollen and cause a problem, so use a pliers and pull the foam out and throw it away.  You may want to rinse them off and dry the outside with paper towels before putting them back.  Note of caution… on the thumb hold of each cleaner is a small white label that has a black rectangle printed on it.  The carriage uses that rectangle to verify the presence of the cleaner.  If it is covered with ink or missing, cut a piece of self stick label and draw a rectangle with a black pen where the mark needs to be.

If the ink is spilled down through the machine, it would be good to remove the right cover and clean what you can with paper towels and Windex.  Latex gloves are a good idea or you hands will be stained for days.