How to clean Lava Rock Boulder?
We just purchased a lava rock boulder for one of our front mulch beds. It's smallish (22" x 18" and about 45 lbs.) and has good shape but it's a little dirty and not as red as I think it could be. Does anyone have any suggestions as to how to clean off deep dust/dirt/whatever and bring out the great lava rock red? Other forums explain on how to clean the smaller landscape lava stones and the even smaller fist aquarium lava rock but I'm not seeing a lot of info on how to bring out the deep red from my lava rock boulder. Thanks!