I would use a wet/dry shop vac and suck the water out of the washer thru the fill hose/s.
Then I would hook the hoses to the water spigots and place the washer ends in a bucket (light bucket?) and run the pink till it hits the bucket.
2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping