Engine cranes work well & can be used for other things as can a winch / pully of some sort hanging off a tree branch, rafter, balcony rail etc, etc etc .
An air duster with a 4' long tube hooked up to a compressor will do the job quite fine and also will allow you to do more useful things like clean the debris off the TOP of the deck , under the mower frame and all over the transmission.
