the only way I've had to do it before was with lots and lots of water. The big problem you will run into is that even if the acid drys all it takes is humidity to reactivate it and start eating into the trailer again. If you can flush it with enough water the ph of the acid will move closer to a neutral level where it will not be nearly as corrosive, eventually you can get it all flushed out but it will take the better part of a day with a hose. The baking soda will help neutralize it but it can be a mess to work with and is difficult to get into cracks and under the floors where the acid will have run to.
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