This is the final cache in the DD series. Initially, no help will be given as all will fall neatly into place as you progress through the puzzle. Even with the information and procedures followed from caches DD1 to DD3 in the series, this cache is not intended to be easy street, even if you do go way back. Gee whiz, forgetting the two things that this series is about will make finding the cache impossible. However, with hesitancy, Uncle Bob will help with the mammoth task of finding this cache. Fortunately, it will be all aboard once you make the split.
Firstly you need to shed some light on the task, and wet them four times, before George is seen on the street. Utilise the pike and then the farm. Ultimately you will then need fuel, an absolute necessity, to finish in the north.
Next you need to re-start way back, prior to putting on clothing. Finally, subjectively bored, you need to find the title year and subtract M. Then subtract the last three digits of the fax number from the plate on the bridge at DD1 and add the last two digits of the patent mentioned in DD3 to find the final three digits needed for the east wing.
Please re-set this cache as found after signing the log.
You can check your answers for this puzzle on GeoChecker.com.