VETSCOPE

Hi. So I noticed my dog keeps on scratching his ear. Both ears but mostly on his left ear. Is this ear mites? I have ear wash/drops that I bought on a local store. I wanna try this first before sending him to the vet. Any other tips that you can share to me? Thanks. Also. My dog has not been groomed yet cos he just got his shots last July 2 and the vet advised to refrain from bathing for 7 days. Thanks.