I've always avoided using a flush of any sort. I only ever flush with clear tap water and then replenish with the correct mix of coolant and water .
However, I have a car that the oil cooler had let a little oil into the coolant . When I fit the new oil Cooler I want to flush the system and remove any traces of oil for obvious reasons.
Can someone recommend a flush ? As I say I've never used any sort as I was always led to believe it can cause issues .

Tia

Washing powder dose work few scoops filled with water run it for a day. We have a special flush at daf for when coolers go in the trucks. We mix it with the water then send them out for the day to work. Really good stuff

Thanks
I'd heard washing powder but didn't wanna suggest it and sound stupid 😂

Flushed 20 times , with clear at first , then some washing gel , then water again ! Seems to have cleared it well . Tipped back up with coolant and will see how she goes