I usually climb a ladder and do it by hand but I thought I’d have a look online to see if anyone has any time saving tips for this tedious task.
The first link gives handy information about equipment you might need as well as safety tips and handy hints
I also found this next video that shows you how to make your own extension tool that you can use to hose out the gutters without needing to climb a ladder.
If you need to clean leaves and other debris out of the gutter before hosing it out the following video shows a great idea for making your own cheap scoop to help make the job easier.
Finally, if you are looking to purchase especially designed gutter cleaning tools this next link reviews several interesting products that are currently on the market.