Clean baby nose

My 3mo baby doesn't latch properly when her nose is block. PD and friends suggested to clean baby nose using Sterimar and nasal aspirator. However, the Sterimar spray is so strong! The dirt usually ends up going up the nose and down the throat. My baby also cries when I suck with the nasal aspirator, I think it hurts her. Mummies, is it necessary to use the nasal aspirator with Sterimar? Any other methods to clear the nose?🥺