Boob sweat?

For the past couple months I have noticed that my boob sweat is very strong, not even my armpit sweat smells like that. Anyways I had been dabbing a drop of deodorant between my cleavage along with washing my bras every couple wears and it was seeming to work and keep it fresh but then my best friend saw me doing it and told me that it can stain my skin , well I continued to do it for a week or so and I was out in the sun and I think it stained it now (you can only see it if I pull my boobs/cleavage apart), it could also be a rash or reaction to the deodorant. Does anyone have any suggestions or chest safe products that I can use to keep it smelling nice and fresh ? I’m tired of still feeling fresh and clean but my tits tell me otherwise ! I told my bf to hug me and see if he can smell it and he said no , that I smelled great so at this point idk if my mind is playing tricks on me or why .