Get the pink RV antifreeze (same stuff that you should of pumped into the
water lines after blowing them out) and pour a good amount down each drain.
Remember that you will need to flush out any water that is present in the
traps as it will dilute the antifreeze. One way around this is if you have a
vaccume that can be set to blow. Just blow out each trap then add a small
amount of RV antifreeze for good measure.
Scott
'60 Overlander
Ohio