This is our first boat with a seperate head. I have installed a Thetford MSD with pumpout and vent. Since the boat is still a relatively small space I am not wanting to embarass guests with odors (theirs or mine!). I'm not worried about smells coming from the MSD, I'm thinking of the natural smells that accompany using the toilet. Is there an effective aerosol spray that eliminates odors after using the toilet?