Cleaning Ring Culture Beds

Hi everybody, another new poster. Last year I built in my greenhouse tw
ring culture beds 8ft by 16 inches, lined them with plastic and fille them with about 6inches of builders ballast. I then grew tomatoes o them in bottomless pots. It was very successful.
I am getting ready for this year now and wonder how I am going to clea them. Removing the stones would be difficult so I was wondering if there wa anything I could use to swamp the beds with that would do the job. was thinking of Jeyes fluid but would it be safe for tomatoes.
Any Ideas ? Many thanks folks
-- Jabsco
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