This is a magnetic traditional cache that is designed for stealth operations. You're looking for a small DNA pot, cleverly constructed with some gaffer tape. Bring some tweezers. It should be easy to find, so you don't spend too long rummaging. Perfect Cache & Dash. No space for TBs, this is a small one!
The name of the cache is the biggest clue. West Garth Road is a hilly area with lots of other caches to explore.
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Congratulations to Bowleeow for FTF!