Originally Posted by The Gritz Carlton
Pour a little vegetable or olive oil in the bowl before storage...just enough to cover the bottom. It doesn't evaporate near as fast as water, isn't petroleum based and will not damage anything. Go as clear as possible...not the deep yellow colored.
I've thought about doing this several times...but I'm reluctant. Oil goes rancid...and I keep imagining the sticky oil residue staining mess left ringing the bowl.... nothing a little soapy water wouldn't take care of I suppose, but still...not something I want to deal with when getting rady to take her out on the road.
Instead, I've been in the habit of pouring a shot of the blue tank chemical into the bowl with a few inches of water in it...basically making a higher viscosity blue bowl fill with pleasant aroma
Honestly I've never really verified if it slows the evaporation or not, but it seems like it might.... Once in a while if it's in storage an extra long time I'll add a bit more water to it, but it's not often...