I have an Epson Stylus Color 800 printer that I have not used for a long time. I put new ink in the cartridge and let it sit overnight. I then installed the cartridge in the printer and ran several head cleaning cycles. The printer does all the right things to print but no printing shows on the page. I think the heads must be clogged from sitting so long. Is there a way to clean them so they work again. I have not disassembled the printer yet.