Can I put a little baking soda in my TT toilet?

If the trailer has not been used for a long time, make sure there is water in the p traps for the sinks amd shower (the up down pipe in the drain line under the sink). If it is dried out odors can come out that way.pour water into the sink if there no freezing, rv antifreeze if a chance of freezing.

In some units the bathroom sink may drain into the black tank. Gray tanks can also cause odors.