For cleaning of the wool bonnets, synthetic wool bonnets, foam pads, terry cloth bonnets, just place them into the washer with some light soap. You can use the warm cycle while doing this. When the washing cycle is done, the pads will go through their normal rinse cycle. Following this, the pads will go through their spin cycle.
After the spin cycle has finished, just remove the pads from the machine & place them on a towel to finish their normal air drying. There is no need to place the pads into the dryer. You will make their lifespan shorter & the possibility of picking up leftnover microsopic fibers of any anti static drying cloths.
A good normal pratice is to just let the pads dry out with the normal air. You can place them on a high shelf near the ceiling of your room as the heat rises & the warmest area is up high in the air.