Apparently, according to the volume 67 SBS:
Luffy, Zoro, and Brook take a bath once a week. (gross)
Franky, Usopp, and Chopper take a bath 3 days a week.
Nami, Robin, and Sanji take a bath every day, and Robin and Nami invite Chopper to go with them. (of course)
You would think Zoro took a bath every day considering how much he works out.
I can't see Brook taking a bath, though.
Also, a lot of people thought that Tashigi didn't wear a bra, but Smoker actually tore it off.
A reader told their friend that Robin doesn't like to show her boobs, but Oda likes boobs. He confirms this. xD
Jinbe's alternative names for his plan:
The Great Strawhat is a Hero Plan
The Great We Adore Humans Plan
The Great To Hell With What History Has to Say Plan <--- the best one xD
Lastly, the sound effects when Zoro eats the bento from Sanji when going to Punk Hazard, it's because Sanji actually did put posion and razors in the bento "per their fight!' xD
There's some other stuff but I'm too lazy to post more. You can go check it out at:
Credits to Greg from APF/RF.