Two easy choices.

1) Spray it down with an aerosol engine cleaner/degreaser and then wash it off with a hose.

2) or same as above and then use an electric power washer afterwards.

3) or, same as 1 & 2, then spray some Fantastik or 409 to remove the engine degreaser and then power wash it again.

Take it for a spin around the block and it will be dry in this heat. I'm fortunate to have an air compressor so I can use that to blow the water off the parts.