When my preschooler has to wash his hands so frequently I thought I'd make it into a fun time.
He loves music and singing so we sing the little ditty.
Round and round the Garden like a Teddy bear (during this time we put soap on our hands and rub round and round and round and round)
One step, two step (rub around again)
Tickle 'em under there (we tickle the running water to wash off the soap bubbles).
He loves it and it gets the job done!