dude seriously, i clean mine every week weather it needs it or not.
buy some swabs(lint free) from a dealer, fellers.com maybe and buy a small amount of solvent ink cleaner.
dip the swab in the cleaner, wipe off excess.
#1 clean the heads (NOT BOTTOM) sides only. this will take a while if you have never done it. use one, two or three swabs for each head, dont interchange the swabs between heads. clean till theres no more color coming off the sides, front and back of the heads.
#2 wipers if you havent replace them. if you cant then clean them and stick'em back.
#3 clean the wiper scraper. thats what scrapes the ink off the wipers. replace this first chance you get. its like $3
#4 clean the capping station caps, dont remove just clean in place and be careful to not get chunks of dried ink in there.
if you havent cleaned for a while or ever this would take 12 or so swabs for me to do.
if you do this every week it is real quick and simple and takes me 4 swabs and just a touch of cleaning fluid, and about 30mins total. this simple maintainance will save you big money in the long run. like 12 foot long prints with bands that you have to reprint because of poor cleaning.
last: doing a head cleaning only cleans the lines and inside the heads, if theres a bunch of ink chunks on the wiper or scraper then you are just wasting ink$. when the real problem was that nice chunk of magenta ink on the scraper that just kept smearing it onto the print head with no or small results with every push of the cleaning button.
my $.02