Is it safe to pour sulphuric acid down the sink? Caustic soda was put down about 1 week ago?

We have a drain blockage and someone put caustic soda down the drain about 6 days ago. Do you think it will be safe to put sulphuric acid drain cleaner down there by now? Because you aren't supposed to mix sulphuric acid and caustic soda
Update: Sink blockage, not drain. The blockage is quite far down. About 3 meters
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