bleaching rocks

ok... i have never bleached rocks before, i have always just went to creeks or whatnot and found rocks and brought them home and just scrubbed them really good... well, yesterday i went to a landscape place and purchased about 7 big rocks(small boulders)... i didn't realize how cheaps rocks are. i always thought they would be exspensive...

anyway, i was gonna just boil them, but i couldn't find a pot big enough to fit the rocks, so i am bleaching them now instead...

my question is how other people bleach there rocks... this is what i am doing now...

i brought the rocks home and ran them under hot water and scrubbed them first... then i put the rocks in a rubbermaid container with roughly a 4-5 to 1 mix between water and bleach... i let them soak for about 24 hours... now i am in the process of rinsing... i emptied the containers of the rocks, rinsed the containers out good, and put rocks back in and filled container up with just water... i let them sit for about an hour and emptied... i am repeating a couple more times, and then i am gonna let them sit overnight in the final rinse...

is this an ok way of doing this, or should i start over with a different way... thanks in advance i hope for the comments...