Instead, let the grease cool and pour it into old newspapers. Throw it away with the trash. Running the garbage disposal while the automatic dishwasher is emptying into it is a great way to clean out the disposal. If dishes are hand-washed, pour the used dishwater down the disposal and run it to clean it out. Be sparing with chemical cleaners, particularly if the home's plumbing contains brass, steel or cast-iron traps and drainpipes.
Some chemicals can corrode metal pipes.
Instead, use an enzymatic cleaner that's not acid-based. The enzymes are germs that speed the decaying process. Using the right preventative chemicals can help prevent clogs from forming. If using preventative cleaners, try to do so at the end of the day when there will be no more water run through the drains. The cleaner will have a chance to remain in the drain and work before being washed away.