By using the IPriceDetailService:
Here is a starting point https://vimvq1987.com/permanently-drop-prices-products/
You can change UpdatePrices to something like this
var prices = _priceDetailService.List(contentLink); _priceDetailService.Delete(newPrices.Select(x => x.PriceValueId));
You can also use IPriceService.SetCatalogEntryPrices() which can delete prices if you pass an empty price list.
It'd be interesting to see which is faster ...
Hello, how to delete all data from pricing programmatically ?