One possible workaround is to use a Zap to set a specific date value (e.g. 1900-01-01) for the given field, and couple that with a Salesforce Workflow Rule that does a Field Update to set a NULL value.

Thanks for your answer Troy.

So i guess there is no way to use a keyword in Zapier to clear the field, like the $$CLEAR$$ command you can use in Hubspot actions to clear a specific field. Is that right ?

I am unsure, there may be.

Hi @Davd alves!

I can confirm that there is no way to do this with Zapier alone. We have an existing feature request, and I’ve gone ahead and added you to that. 

In the feature request I saw a comment that had this from a customer:

As a workaround, we managed to use Zapier to update fields which then trigger Salesforce process builder to update the fields we wanted with null values. A little clunky but seems to get the job done!

So it looks like Try was on the right path :)

Thanks for both Reply, I wil work around all that