As soon as the chicks have dried and fluffed up completely, remove them from the incubator and place them in holding quarters where the temperature is approximately 95o F (35 C). Then give them fresh water and feed. Rearing the chicks as a project has certain limitations, but if they are to be kept for a few days, they should be given a chick-starting mash obtainable at any feed or farm supply store. Fresh water is also important.
Since the disposal of day-old or started chicks may be difficult, have the solution to this problem worked out before you undertake this project. If you are going to rear the chicks at home, secure your parents' permission and cooperation in advance.
Cleaning the incubator. When the hatch is completed, disconnect the incubator. Remove all shells and unhatched eggs and wipe the interior clean with a soapy sponge. Permit the incubator to air dry for several days by leaving the door open.
Cleaning can be made easier if you place a layer or two of cheesecloth or crinoline on the rack on the 17th or 18th day of incubation to catch the egg shell and other debris. This will also help to prevent injury to the chicks' navels. After the chicks are removed the cheesecloth can be discarded.
http://chickscope.beckman.uiuc.edu/resources/egg_to_chick/procedures.html