Drupal 8 Views filer results by logged in user association
You can find answers here with detailed steps about how to do that. Search for "sibling entity reference" or something longer. 

Basically, you do do it with a couple of Relationships and a Contextual filter. You need Relationships to get the referenced Content into your Views, because when you create Products views you will only have Products fields available. 

So you create a list of Products, add the ER Relationship for the Client info, add another Relationship that is using the first one for the users referencing the Client, then you can add the User ID contextual filter that is using the second Relationship and set it to provide default value from Logged in user.