It's pretty easy, just messy and time consuming. Fill a 5 gallon bucket about 1/3 full of dirty sand, turn the waterhose on full blast and stick it in the bucket all the way to the bottom, swish the sand around with your hand and keep rinsing until the runoff water turns clear. Drain the water off, dump clean sand in another bucket, fill dirty bucket 1/3 full of sand. Repeat until you either get done, or decide that new sand would be worth it LOL. I normally rinse all sand that I get my hands on, let it sit in the clean bucket until dry, then store in a clean brute trash can until I need it.