Place the white pea stones into a bucket. Fill the bucket halfway or less with stones. Do this job outdoors, or use a bathtub or utility sink.
Insert a garden hose deeply into the stones and turn on the water. Indoors, turn on the tub or sink faucet. Let water run through the stones and overflow from the bucket.
Swish the gravel around with a stick or your hand. Turn off the water after it runs clean.