I did work experience for this vet and he takes no shit

Sorry if it seems I'm taking advantage of your expertise but I posted in r/labradors and haven't gotten any replies yet. Are there any topical flea treatments that you can recommend that are safe and effective for a 2 year old lab that I can buy at the store? We cannot see a vet as me and my SO both have commitments during business hours every day of the week and my dog is suffering badly with fleas. He is missing patches of hair and I'm desperate to help him. At this point I am bathing him often with dawn dish soap (I've read this helps, but it seems to only help during the bath and not after) and then a conditioner but my SO is allergic to dogs and I can't keep bringing my lab inside for baths without my SO having terrible breathing problems. Anything you can recommend would be soooooooo appreciated.

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