updating SFDC non null values with Null value

[Sim]

I am trying to update certain records in SFDC. The issue has been that the update is not updating the previous non null value in SFDC with NULL value. 

In data loader, there is an option to choose Insert Null values which does the trick. But Alteryx does not have

that option.

I tried replacing the NULL values in database with Space. And tried to update SFDC. Still this is not working. 

Thanks,

[NicolasDestombes]

Same issue for me: do we have a solution from @Alteryx