by pouring massive amounts of drain cleaner or by using something like a coat hanger? My better half poured grease then shoved leftovers down the disposal, added some more grease and whalla... every drain in the house overflowed. Final cost was @ $1200,00.00 for repairs, not to mention we had to go to a motel because of toxic fumes for 4 days. Be honest and tell if you've done something similar.