OGgrowsanswered grow question 5 years ago since you have no chance of obtaining a substrate cleaner. there is another trick when the soil does not drain the water well, put a small dose of manual liquid detergent for the dishes before watering the plants or making the flush, attention has to be a 100% ecological neutral detergent, found in any big supermarket. I never tried, I don't know if using detergent in this final flowering stage can change the flavor of the herb, but I've seen great experts do it like Jorge Cervantes