I open a jar full of moth balls when I'm not on the boat and leave that out. Like you,... I'm a trailer sailor.... so before I leave for the lake, I close the jar, open the hatches and drive down the road to air out the boat...the smell is gone before I get to the lake. BTW... the active ingredient in moth balls also kills mold spores. I get a lot of push back on this site whenever I mention moth balls but for the way I use the boat, it works for me.... for people who do not have the drive to the lake, I guess the smell sticks around... but for me.... the boat is fresh, bug free and more importantly, mold free....