Remove old hair from the brush using a towel to grab it or a long-tail teasing comb to lift the hair vertically off the brush. To remove dirt and oil that may still cling to the bristles after hair has been removed, place brushes in a sinkful of warm water and diluted shampoo or antibacterial dishwashing liquid.
Both types of irons can acquire buildup if you use product in the hair. Plug in the iron and put it on high heat. Using a clean rag folded up several times, apply oven cleaner to dissolve the film.
Professional dryers usually have a screen in the back of the dryer that you can remove in order to clean out lint. If lint accumulates, the dryer's "motor" will be less effective. If your dryer does not have a removable screen, use tweezers to lift lint from the screen.