Fatboy

Hey guys,
I suspect my evaporator core is dirty or plugged up with trash/leaves etc. The AC seems to be performing as expected, but the air is not being cooled enough. The lines going into and out of the evaporator box are extremely cold, but the air blowing out is not real cold. I put a valve on the heater lines and closed it to make sure I didn't have hot water flowing through the box. Anyone else have any ideas besides cleaning?
If I do need to clean it, does anyone know any way to do it besides removing the heater box?
Thanks,
Lee