drip-clean was designed to help with salt buildup in your drip-lines (like a soap?). it might help with your coco... but i am not sure...
when you start using less nutes then there will be no buildup in your medium.
IMO, pre-flushing your coco is recommended because most hydro stores have bug problems which enter the mediums they sell. too many times i encountered fungus gnats from compressed brick coco. you may have been lucky with your coco, but i don't take a chance anymore. i even amend it with mosquito bits so i get a head start on the lavre.
pre-flush as a precaution, feed simple and lightly, and reuse your coco.
when you start using less nutes then there will be no buildup in your medium.
IMO, pre-flushing your coco is recommended because most hydro stores have bug problems which enter the mediums they sell. too many times i encountered fungus gnats from compressed brick coco. you may have been lucky with your coco, but i don't take a chance anymore. i even amend it with mosquito bits so i get a head start on the lavre.
pre-flush as a precaution, feed simple and lightly, and reuse your coco.