Query for Relations

Hey, is there a way to query a Class based on a relation field?Structure:
Class “Products” contains a field “valid_for” which contains a relation to the Class "Manufacturer"Now i want to query for the manufacturer based on the filter selection of the user. (mutiple) But at the moment i have no idea, how to fetch the products, based on this. Any idea?

Take a look in this query examples: https://docs.parseplatform.org/rest/guide/#relational-queries

I hope it helps.