I'm not sure if Dettol kills the virus or not. It's anti-bacterial, not anti-viral. I had a look at their website and it says it kills 'some' viruses'. You'd have to identify its active ingredient and then do a bit of research on it.
On the other hand, bleach does kill it as far as I can see (I've been googling, frequently). Milton, or equivalent baby sterilising fluid is safer than household bleach as it doesn't have the same additives, just sodium hypochlorite , the virus killer...
When everyone was clearing the shelves of soap and hand gel I bought 2 litres of Boots baby sterilising liquid perfectly easily, one for me, one for my daughter. I'm putting my trust in that! Made up daily as per directions (only in half quantities, though. I'd be surprised if anyone could get through a gallon of disinfectant per day!) You can use it for sterilising veg, wiping surfaces etc.