sadly i don't have a garden.
how can i wash them to make sure that no stones have any dust or debris in them just a bucket wash like suggested?
im not sure if this would clean all the debris inside the holes etc...
hot water and washing up liquid,
That suggestion was purely to clean the sink with before using it to clean the dragon stonePlease don`t use washing up liquid on anything that goes into the tank. Dragonstone is dense but has a lot of nooks and crannies that the chemicals can go into and then potentially leach back out into your tank. Not worth the risk in my opinion.