Yeah, I'll baste off the rocks a bit every water change and siphon the sand I can access without moving stuff. Opted for the ultra detailed clean and got my little feeding pipette down in all the tiny holes to blow out all the stuff deep down inside the rock. I was amazed how much is way in there that a baster can't reach.Ahh...man that sounds like a lot dirty work that is needed. I am sure it'll work out...hopefully without need for chemiclean.
Usually when I do water change, I make it a habit to blow the rock with squirts of water using a baster before I start siphoning the water from the tank to ensure I pick up as much of that debris as possible. I rest I leave it up to the filtration. This way at least there is little chance of dead spots long term.