im guessing your growing in soil just give them regular feedings. What can be done to speed up the process is find a bucket like 30 gal, place a stole in there and let the plant sit on top of the stole, then just run water onto the pot and don't let it flood, if u see the bottom water running clear then your good to go give it a few more days of water and your plant is completely flush.
btw, after you run it and the water starts coming out of the pot clean, leave it there for a awhile to let gravity do its thing and get all of that water out of your pot then you can safely put it back to its growing spot.